diff --git a/models/forgejo_migrations/migrate.go b/models/forgejo_migrations/migrate.go
index 8ac2fb63f2..f0e22c046f 100644
--- a/models/forgejo_migrations/migrate.go
+++ b/models/forgejo_migrations/migrate.go
@@ -46,6 +46,8 @@ var migrations = []*Migration{
 	NewMigration("create the forgejo_auth_token table", forgejo_v1_20.CreateAuthorizationTokenTable),
 	// v3 -> v4
 	NewMigration("Add default_permissions to repo_unit", forgejo_v1_22.AddDefaultPermissionsToRepoUnit),
+	// v4 -> v5
+	NewMigration("create the forgejo_repo_flag table", forgejo_v1_22.CreateRepoFlagTable),
 }
 
 // GetCurrentDBVersion returns the current Forgejo database version.
diff --git a/models/forgejo_migrations/v1_22/v5.go b/models/forgejo_migrations/v1_22/v5.go
new file mode 100644
index 0000000000..55f9fe1338
--- /dev/null
+++ b/models/forgejo_migrations/v1_22/v5.go
@@ -0,0 +1,22 @@
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_22 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+type RepoFlag struct {
+	ID     int64  `xorm:"pk autoincr"`
+	RepoID int64  `xorm:"UNIQUE(s) INDEX"`
+	Name   string `xorm:"UNIQUE(s) INDEX"`
+}
+
+func (RepoFlag) TableName() string {
+	return "forgejo_repo_flag"
+}
+
+func CreateRepoFlagTable(x *xorm.Engine) error {
+	return x.Sync(new(RepoFlag))
+}
diff --git a/models/repo/repo_flags.go b/models/repo/repo_flags.go
new file mode 100644
index 0000000000..de76ed2b37
--- /dev/null
+++ b/models/repo/repo_flags.go
@@ -0,0 +1,102 @@
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repo
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+
+	"xorm.io/builder"
+)
+
+// RepoFlag represents a single flag against a repository
+type RepoFlag struct { //revive:disable-line:exported
+	ID     int64  `xorm:"pk autoincr"`
+	RepoID int64  `xorm:"UNIQUE(s) INDEX"`
+	Name   string `xorm:"UNIQUE(s) INDEX"`
+}
+
+func init() {
+	db.RegisterModel(new(RepoFlag))
+}
+
+// TableName provides the real table name
+func (RepoFlag) TableName() string {
+	return "forgejo_repo_flag"
+}
+
+// ListFlags returns the array of flags on the repo.
+func (repo *Repository) ListFlags(ctx context.Context) ([]RepoFlag, error) {
+	var flags []RepoFlag
+	err := db.GetEngine(ctx).Table(&RepoFlag{}).Where("repo_id = ?", repo.ID).Find(&flags)
+	if err != nil {
+		return nil, err
+	}
+	return flags, nil
+}
+
+// IsFlagged returns whether a repo has any flags or not
+func (repo *Repository) IsFlagged(ctx context.Context) bool {
+	has, _ := db.Exist[RepoFlag](ctx, builder.Eq{"repo_id": repo.ID})
+	return has
+}
+
+// GetFlag returns a single RepoFlag based on its name
+func (repo *Repository) GetFlag(ctx context.Context, flagName string) (bool, *RepoFlag, error) {
+	flag, has, err := db.Get[RepoFlag](ctx, builder.Eq{"repo_id": repo.ID, "name": flagName})
+	if err != nil {
+		return false, nil, err
+	}
+	return has, flag, nil
+}
+
+// HasFlag returns true if a repo has a given flag, false otherwise
+func (repo *Repository) HasFlag(ctx context.Context, flagName string) bool {
+	has, _ := db.Exist[RepoFlag](ctx, builder.Eq{"repo_id": repo.ID, "name": flagName})
+	return has
+}
+
+// AddFlag adds a new flag to the repo
+func (repo *Repository) AddFlag(ctx context.Context, flagName string) error {
+	return db.Insert(ctx, RepoFlag{
+		RepoID: repo.ID,
+		Name:   flagName,
+	})
+}
+
+// DeleteFlag removes a flag from the repo
+func (repo *Repository) DeleteFlag(ctx context.Context, flagName string) (int64, error) {
+	return db.DeleteByBean(ctx, &RepoFlag{RepoID: repo.ID, Name: flagName})
+}
+
+// ReplaceAllFlags replaces all flags of a repo with a new set
+func (repo *Repository) ReplaceAllFlags(ctx context.Context, flagNames []string) error {
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if err := db.DeleteBeans(ctx, &RepoFlag{RepoID: repo.ID}); err != nil {
+		return err
+	}
+
+	if len(flagNames) == 0 {
+		return committer.Commit()
+	}
+
+	var flags []RepoFlag
+	for _, name := range flagNames {
+		flags = append(flags, RepoFlag{
+			RepoID: repo.ID,
+			Name:   name,
+		})
+	}
+	if err := db.Insert(ctx, &flags); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
diff --git a/models/repo/repo_flags_test.go b/models/repo/repo_flags_test.go
new file mode 100644
index 0000000000..0e4f5c1ba9
--- /dev/null
+++ b/models/repo/repo_flags_test.go
@@ -0,0 +1,114 @@
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repo_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRepositoryFlags(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 10})
+
+	// ********************
+	// ** NEGATIVE TESTS **
+	// ********************
+
+	// Unless we add flags, the repo has none
+	flags, err := repo.ListFlags(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Empty(t, flags)
+
+	// If the repo has no flags, it is not flagged
+	flagged := repo.IsFlagged(db.DefaultContext)
+	assert.False(t, flagged)
+
+	// Trying to find a flag when there is none
+	has := repo.HasFlag(db.DefaultContext, "foo")
+	assert.False(t, has)
+
+	// Trying to retrieve a non-existent flag indicates not found
+	has, _, err = repo.GetFlag(db.DefaultContext, "foo")
+	assert.NoError(t, err)
+	assert.False(t, has)
+
+	// Deleting a non-existent flag fails
+	deleted, err := repo.DeleteFlag(db.DefaultContext, "no-such-flag")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(0), deleted)
+
+	// ********************
+	// ** POSITIVE TESTS **
+	// ********************
+
+	// Adding a flag works
+	err = repo.AddFlag(db.DefaultContext, "foo")
+	assert.NoError(t, err)
+
+	// Adding it again fails
+	err = repo.AddFlag(db.DefaultContext, "foo")
+	assert.Error(t, err)
+
+	// Listing flags includes the one we added
+	flags, err = repo.ListFlags(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, flags, 1)
+	assert.Equal(t, "foo", flags[0].Name)
+
+	// With a flag added, the repo is flagged
+	flagged = repo.IsFlagged(db.DefaultContext)
+	assert.True(t, flagged)
+
+	// The flag can be found
+	has = repo.HasFlag(db.DefaultContext, "foo")
+	assert.True(t, has)
+
+	// Added flag can be retrieved
+	_, flag, err := repo.GetFlag(db.DefaultContext, "foo")
+	assert.NoError(t, err)
+	assert.Equal(t, "foo", flag.Name)
+
+	// Deleting a flag works
+	deleted, err = repo.DeleteFlag(db.DefaultContext, "foo")
+	assert.NoError(t, err)
+	assert.Equal(t, int64(1), deleted)
+
+	// The list is now empty
+	flags, err = repo.ListFlags(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Empty(t, flags)
+
+	// Replacing an empty list works
+	err = repo.ReplaceAllFlags(db.DefaultContext, []string{"bar"})
+	assert.NoError(t, err)
+
+	// The repo is now flagged with "bar"
+	has = repo.HasFlag(db.DefaultContext, "bar")
+	assert.True(t, has)
+
+	// Replacing a tag set with another works
+	err = repo.ReplaceAllFlags(db.DefaultContext, []string{"baz", "quux"})
+	assert.NoError(t, err)
+
+	// The repo now has two tags
+	flags, err = repo.ListFlags(db.DefaultContext)
+	assert.NoError(t, err)
+	assert.Len(t, flags, 2)
+	assert.Equal(t, "baz", flags[0].Name)
+	assert.Equal(t, "quux", flags[1].Name)
+
+	// Replacing flags with an empty set deletes all flags
+	err = repo.ReplaceAllFlags(db.DefaultContext, []string{})
+	assert.NoError(t, err)
+
+	// The repo is now unflagged
+	flagged = repo.IsFlagged(db.DefaultContext)
+	assert.False(t, flagged)
+}
diff --git a/modules/setting/repository.go b/modules/setting/repository.go
index b6b0b50504..fd17fbf55d 100644
--- a/modules/setting/repository.go
+++ b/modules/setting/repository.go
@@ -113,6 +113,9 @@ var (
 			Wiki              []string
 			DefaultTrustModel string
 		} `ini:"repository.signing"`
+
+		SettableFlags []string
+		EnableFlags   bool
 	}{
 		DetectedCharsetsOrder: []string{
 			"UTF-8",
@@ -270,6 +273,8 @@ var (
 			Wiki:              []string{"never"},
 			DefaultTrustModel: "collaborator",
 		},
+
+		EnableFlags: false,
 	}
 	RepoRootPath string
 	ScriptType   = "bash"
@@ -372,4 +377,6 @@ func loadRepositoryFrom(rootCfg ConfigProvider) {
 			log.Error("Unrecognised repository download or clone method: %s", method)
 		}
 	}
+
+	Repository.EnableFlags = sec.Key("ENABLE_FLAGS").MustBool()
 }
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 96cdd9ca46..bcb94bff25 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -96,6 +96,9 @@ func NewFuncMap() template.FuncMap {
 		"AppDomain": func() string { // documented in mail-templates.md
 			return setting.Domain
 		},
+		"RepoFlagsEnabled": func() bool {
+			return setting.Repository.EnableFlags
+		},
 		"AssetVersion": func() string {
 			return setting.AssetVersion
 		},
diff --git a/routers/web/repo/flags/manage.go b/routers/web/repo/flags/manage.go
new file mode 100644
index 0000000000..840f6c3773
--- /dev/null
+++ b/routers/web/repo/flags/manage.go
@@ -0,0 +1,49 @@
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package flags
+
+import (
+	"net/http"
+
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+const (
+	tplRepoFlags base.TplName = "repo/flags"
+)
+
+func Manage(ctx *context.Context) {
+	ctx.Data["IsRepoFlagsPage"] = true
+	ctx.Data["Title"] = ctx.Tr("repo.admin.manage_flags")
+
+	flags := map[string]bool{}
+	for _, f := range setting.Repository.SettableFlags {
+		flags[f] = false
+	}
+	repoFlags, _ := ctx.Repo.Repository.ListFlags(ctx)
+	for _, f := range repoFlags {
+		flags[f.Name] = true
+	}
+
+	ctx.Data["Flags"] = flags
+
+	ctx.HTML(http.StatusOK, tplRepoFlags)
+}
+
+func ManagePost(ctx *context.Context) {
+	newFlags := ctx.FormStrings("flags")
+
+	err := ctx.Repo.Repository.ReplaceAllFlags(ctx, newFlags)
+	if err != nil {
+		ctx.Flash.Error(ctx.Tr("repo.admin.failed_to_replace_flags"))
+		log.Error("Error replacing repository flags for repo %d: %v", ctx.Repo.Repository.ID, err)
+	} else {
+		ctx.Flash.Success(ctx.Tr("repo.admin.flags_replaced"))
+	}
+
+	ctx.Redirect(ctx.Repo.Repository.HTMLURL() + "/flags")
+}
diff --git a/routers/web/web.go b/routers/web/web.go
index 9e48b8872e..c3293ba7f1 100644
--- a/routers/web/web.go
+++ b/routers/web/web.go
@@ -38,6 +38,7 @@ import (
 	"code.gitea.io/gitea/routers/web/repo"
 	"code.gitea.io/gitea/routers/web/repo/actions"
 	"code.gitea.io/gitea/routers/web/repo/badges"
+	repo_flags "code.gitea.io/gitea/routers/web/repo/flags"
 	repo_setting "code.gitea.io/gitea/routers/web/repo/setting"
 	"code.gitea.io/gitea/routers/web/user"
 	user_setting "code.gitea.io/gitea/routers/web/user/setting"
@@ -1574,6 +1575,13 @@ func registerRoutes(m *web.Route) {
 			gitHTTPRouters(m)
 		})
 	})
+
+	if setting.Repository.EnableFlags {
+		m.Group("/{username}/{reponame}/flags", func() {
+			m.Get("", repo_flags.Manage)
+			m.Post("", repo_flags.ManagePost)
+		}, adminReq, context.RepoAssignment, context.UnitTypes())
+	}
 	// ***** END: Repository *****
 
 	m.Group("/notifications", func() {
diff --git a/templates/custom/repo_flag_banners.tmpl b/templates/custom/repo_flag_banners.tmpl
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/templates/repo/admin_flags.tmpl b/templates/repo/admin_flags.tmpl
new file mode 100644
index 0000000000..2a65c9c687
--- /dev/null
+++ b/templates/repo/admin_flags.tmpl
@@ -0,0 +1,8 @@
+{{if .Repository.IsFlagged $.Context}}
+	<div class="ui info message" style="text-align: left">
+		<strong>{{ctx.Locale.Tr "repo.admin.enabled_flags"}}</strong>
+		{{range .Repository.ListFlags $.Context}}
+			<span class="ui label">{{.Name}}</span>
+		{{end}}
+	</div>
+{{end}}
diff --git a/templates/repo/flags.tmpl b/templates/repo/flags.tmpl
new file mode 100644
index 0000000000..3928cf0e17
--- /dev/null
+++ b/templates/repo/flags.tmpl
@@ -0,0 +1,33 @@
+{{template "base/head" .}}
+<div role="main" aria-label="{{.Title}}" class="page-content repository">
+	{{template "repo/header" .}}
+	<div class="ui container">
+		{{template "base/alert" .}}
+		<div class="user-main-content twelve wide column">
+			<h4 class="ui top attached header">
+				{{ctx.Locale.Tr "repo.admin.manage_flags"}}
+			</h4>
+			<div class="ui attached segment">
+				<form class="ui form" action="{{.Link}}" method="post">
+					{{.CsrfTokenHtml}}
+					<strong>{{ctx.Locale.Tr "repo.admin.enabled_flags"}}</strong>
+					<div class="ui segment gt-pl-4">
+						{{range $flag, $checked := .Flags}}
+							<div class="field">
+								<div class="ui checkbox{{if $checked}} checked{{end}}">
+									<input name="flags" type="checkbox" value="{{$flag}}" {{if $checked}}checked{{end}}>
+									<label>{{$flag}}</label>
+								</div>
+							</div>
+						{{end}}
+					</div>
+
+					<div class="field">
+						<button class="ui primary button">{{ctx.Locale.Tr "repo.admin.update_flags"}}</button>
+					</div>
+				</form>
+			</div>
+		</div>
+	</div>
+</div>
+{{template "base/footer" .}}
diff --git a/templates/repo/header.tmpl b/templates/repo/header.tmpl
index 93102467cc..ef3e40eea8 100644
--- a/templates/repo/header.tmpl
+++ b/templates/repo/header.tmpl
@@ -212,6 +212,12 @@
 
 				{{template "custom/extra_tabs" .}}
 
+				{{if and RepoFlagsEnabled .SignedUser.IsAdmin}}
+					<a class="{{if .IsRepoFlagsPage}}active {{end}}item" href="{{.RepoLink}}/flags">
+						{{svg "octicon-milestone"}} {{ctx.Locale.Tr "repo.admin.manage_flags"}}
+					</a>
+				{{end}}
+
 				{{if .Permission.IsAdmin}}
 					<a class="{{if .PageIsRepoSettings}}active {{end}} item" href="{{.RepoLink}}/settings">
 						{{svg "octicon-tools"}} {{ctx.Locale.Tr "repo.settings"}}
diff --git a/templates/repo/home.tmpl b/templates/repo/home.tmpl
index eb6d96f28e..5e27d9160c 100644
--- a/templates/repo/home.tmpl
+++ b/templates/repo/home.tmpl
@@ -52,6 +52,14 @@
 			</div>
 		</div>
 		{{end}}
+
+		{{if RepoFlagsEnabled}}
+			{{template "custom/repo_flag_banners" .}}
+			{{if .SignedUser.IsAdmin}}
+				{{template "repo/admin_flags" .}}
+			{{end}}
+		{{end}}
+
 		{{if .Repository.IsArchived}}
 			<div class="ui warning message gt-text-center">
 				{{if .Repository.ArchivedUnix.IsZero}}
diff --git a/tests/integration/repo_flags_test.go b/tests/integration/repo_flags_test.go
new file mode 100644
index 0000000000..a335ca9adf
--- /dev/null
+++ b/tests/integration/repo_flags_test.go
@@ -0,0 +1,242 @@
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/routers"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRepositoryFlagsUIDisabled(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+	defer test.MockVariableValue(&setting.Repository.EnableFlags, false)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	admin := unittest.AssertExistsAndLoadBean(t, &user_model.User{IsAdmin: true})
+	session := loginUser(t, admin.Name)
+
+	// With the repo flags feature disabled, the /flags route is 404
+	req := NewRequest(t, "GET", "/user2/repo1/flags")
+	session.MakeRequest(t, req, http.StatusNotFound)
+
+	// With the repo flags feature disabled, the "Modify flags" tab does not
+	// appear for instance admins
+	req = NewRequest(t, "GET", "/user2/repo1")
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	doc := NewHTMLParser(t, resp.Body)
+	flagsLinkCount := doc.Find(fmt.Sprintf(`a[href="%s/flags"]`, "/user2/repo1")).Length()
+	assert.Equal(t, 0, flagsLinkCount)
+}
+
+func TestRepositoryFlagsUI(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+	defer test.MockVariableValue(&setting.Repository.EnableFlags, true)()
+	defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+	// *******************
+	//  ** Preparations **
+	// *******************
+	flaggedRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	unflaggedRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 4})
+
+	// **************
+	//  ** Helpers **
+	// **************
+
+	adminUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{IsAdmin: true}).Name
+	flaggedOwner := "user2"
+	flaggedRepoURLStr := "/user2/repo1"
+	unflaggedOwner := "user5"
+	unflaggedRepoURLStr := "/user5/repo4"
+	otherUser := "user4"
+
+	ensureFlags := func(repo *repo_model.Repository, flags []string) func() {
+		repo.ReplaceAllFlags(db.DefaultContext, flags)
+
+		return func() {
+			repo.ReplaceAllFlags(db.DefaultContext, flags)
+		}
+	}
+
+	// Tests:
+	// - Presence of the link
+	// - Number of flags listed in the admin-only message box
+	// - Whether there's a link to /user/repo/flags
+	// - Whether /user/repo/flags is OK or Forbidden
+	assertFlagAccessAndCount := func(t *testing.T, user, repoURL string, hasAccess bool, expectedFlagCount int) {
+		t.Helper()
+
+		var expectedLinkCount int
+		var expectedStatus int
+		if hasAccess {
+			expectedLinkCount = 1
+			expectedStatus = http.StatusOK
+		} else {
+			expectedLinkCount = 0
+			if user != "" {
+				expectedStatus = http.StatusForbidden
+			} else {
+				expectedStatus = http.StatusSeeOther
+			}
+		}
+
+		var resp *httptest.ResponseRecorder
+		var session *TestSession
+		req := NewRequest(t, "GET", repoURL)
+		if user != "" {
+			session = loginUser(t, user)
+			resp = session.MakeRequest(t, req, http.StatusOK)
+		} else {
+			resp = MakeRequest(t, req, http.StatusOK)
+		}
+		doc := NewHTMLParser(t, resp.Body)
+
+		flagsLinkCount := doc.Find(fmt.Sprintf(`a[href="%s/flags"]`, repoURL)).Length()
+		assert.Equal(t, expectedLinkCount, flagsLinkCount)
+
+		flagCount := doc.Find(".ui.info.message .ui.label").Length()
+		assert.Equal(t, expectedFlagCount, flagCount)
+
+		req = NewRequest(t, "GET", fmt.Sprintf("%s/flags", repoURL))
+		if user != "" {
+			session.MakeRequest(t, req, expectedStatus)
+		} else {
+			MakeRequest(t, req, expectedStatus)
+		}
+	}
+
+	// Ensures that given a repo owner and a repo:
+	// - An instance admin has access to flags, and sees the list on the repo home
+	// - A repo admin does not have access to either, and does not see the list
+	// - A passer by has no access to either, and does not see the list
+	runTests := func(t *testing.T, ownerUser, repoURL string, expectedFlagCount int) {
+		t.Run("as instance admin", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			assertFlagAccessAndCount(t, adminUser, repoURL, true, expectedFlagCount)
+		})
+		t.Run("as owner", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			assertFlagAccessAndCount(t, ownerUser, repoURL, false, 0)
+		})
+		t.Run("as other user", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			assertFlagAccessAndCount(t, otherUser, repoURL, false, 0)
+		})
+		t.Run("as non-logged in user", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			assertFlagAccessAndCount(t, "", repoURL, false, 0)
+		})
+	}
+
+	// **************************
+	// ** The tests themselves **
+	// **************************
+	t.Run("unflagged repo", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+		defer ensureFlags(unflaggedRepo, []string{})()
+
+		runTests(t, unflaggedOwner, unflaggedRepoURLStr, 0)
+	})
+
+	t.Run("flagged repo", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+		defer ensureFlags(flaggedRepo, []string{"test-flag"})()
+
+		runTests(t, flaggedOwner, flaggedRepoURLStr, 1)
+	})
+
+	t.Run("modifying flags", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		session := loginUser(t, adminUser)
+		flaggedRepoManageURL := fmt.Sprintf("%s/flags", flaggedRepoURLStr)
+		unflaggedRepoManageURL := fmt.Sprintf("%s/flags", unflaggedRepoURLStr)
+
+		assertUIFlagStates := func(t *testing.T, url string, flagStates map[string]bool) {
+			t.Helper()
+
+			req := NewRequest(t, "GET", url)
+			resp := session.MakeRequest(t, req, http.StatusOK)
+
+			doc := NewHTMLParser(t, resp.Body)
+			flagBoxes := doc.Find(`input[name="flags"]`)
+			assert.Equal(t, len(flagStates), flagBoxes.Length())
+
+			for name, state := range flagStates {
+				_, checked := doc.Find(fmt.Sprintf(`input[value="%s"]`, name)).Attr("checked")
+				assert.Equal(t, state, checked)
+			}
+		}
+
+		t.Run("flag presence on the UI", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+			defer ensureFlags(flaggedRepo, []string{"test-flag"})()
+
+			assertUIFlagStates(t, flaggedRepoManageURL, map[string]bool{"test-flag": true})
+		})
+
+		t.Run("setting.Repository.SettableFlags is respected", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+			defer test.MockVariableValue(&setting.Repository.SettableFlags, []string{"featured", "no-license"})()
+			defer ensureFlags(flaggedRepo, []string{"test-flag"})()
+
+			assertUIFlagStates(t, flaggedRepoManageURL, map[string]bool{
+				"test-flag":  true,
+				"featured":   false,
+				"no-license": false,
+			})
+		})
+
+		t.Run("removing flags", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+			defer ensureFlags(flaggedRepo, []string{"test-flag"})()
+
+			flagged := flaggedRepo.IsFlagged(db.DefaultContext)
+			assert.True(t, flagged)
+
+			req := NewRequestWithValues(t, "POST", flaggedRepoManageURL, map[string]string{
+				"_csrf": GetCSRF(t, session, flaggedRepoManageURL),
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			flagged = flaggedRepo.IsFlagged(db.DefaultContext)
+			assert.False(t, flagged)
+
+			assertUIFlagStates(t, flaggedRepoManageURL, map[string]bool{})
+		})
+
+		t.Run("adding flags", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+			defer ensureFlags(unflaggedRepo, []string{})()
+
+			flagged := unflaggedRepo.IsFlagged(db.DefaultContext)
+			assert.False(t, flagged)
+
+			req := NewRequestWithValues(t, "POST", unflaggedRepoManageURL, map[string]string{
+				"_csrf": GetCSRF(t, session, unflaggedRepoManageURL),
+				"flags": "test-flag",
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			assertUIFlagStates(t, unflaggedRepoManageURL, map[string]bool{"test-flag": true})
+		})
+	})
+}