diff --git a/github/github-accessors.go b/github/github-accessors.go
index ec77299f2fe..29d092af03f 100644
--- a/github/github-accessors.go
+++ b/github/github-accessors.go
@@ -23510,6 +23510,22 @@ func (r *RepoDependencies) GetVersionInfo() string {
 	return *r.VersionInfo
 }
 
+// GetEnabled returns the Enabled field if it's non-nil, zero value otherwise.
+func (r *RepoImmutableReleasesStatus) GetEnabled() bool {
+	if r == nil || r.Enabled == nil {
+		return false
+	}
+	return *r.Enabled
+}
+
+// GetEnforcedByOwner returns the EnforcedByOwner field if it's non-nil, zero value otherwise.
+func (r *RepoImmutableReleasesStatus) GetEnforcedByOwner() bool {
+	if r == nil || r.EnforcedByOwner == nil {
+		return false
+	}
+	return *r.EnforcedByOwner
+}
+
 // GetBranch returns the Branch field if it's non-nil, zero value otherwise.
 func (r *RepoMergeUpstreamRequest) GetBranch() string {
 	if r == nil || r.Branch == nil {
diff --git a/github/github-accessors_test.go b/github/github-accessors_test.go
index 08332e3776d..00c647c8db5 100644
--- a/github/github-accessors_test.go
+++ b/github/github-accessors_test.go
@@ -30393,6 +30393,28 @@ func TestRepoDependencies_GetVersionInfo(tt *testing.T) {
 	r.GetVersionInfo()
 }
 
+func TestRepoImmutableReleasesStatus_GetEnabled(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue bool
+	r := &RepoImmutableReleasesStatus{Enabled: &zeroValue}
+	r.GetEnabled()
+	r = &RepoImmutableReleasesStatus{}
+	r.GetEnabled()
+	r = nil
+	r.GetEnabled()
+}
+
+func TestRepoImmutableReleasesStatus_GetEnforcedByOwner(tt *testing.T) {
+	tt.Parallel()
+	var zeroValue bool
+	r := &RepoImmutableReleasesStatus{EnforcedByOwner: &zeroValue}
+	r.GetEnforcedByOwner()
+	r = &RepoImmutableReleasesStatus{}
+	r.GetEnforcedByOwner()
+	r = nil
+	r.GetEnforcedByOwner()
+}
+
 func TestRepoMergeUpstreamRequest_GetBranch(tt *testing.T) {
 	tt.Parallel()
 	var zeroValue string
diff --git a/github/repos_immutable_releases.go b/github/repos_immutable_releases.go
new file mode 100644
index 00000000000..1717ed1268b
--- /dev/null
+++ b/github/repos_immutable_releases.go
@@ -0,0 +1,82 @@
+// Copyright 2026 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"fmt"
+)
+
+// RepoImmutableReleasesStatus represents the immutable releases status for a repository.
+type RepoImmutableReleasesStatus struct {
+	Enabled         *bool `json:"enabled,omitempty"`
+	EnforcedByOwner *bool `json:"enforced_by_owner,omitempty"`
+}
+
+// EnableImmutableReleases enables immutable releases for a repository.
+//
+// GitHub API docs: https://docs.github.com/rest/repos/repos#enable-immutable-releases
+//
+//meta:operation PUT /repos/{owner}/{repo}/immutable-releases
+func (s *RepositoriesService) EnableImmutableReleases(ctx context.Context, owner, repo string) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/immutable-releases", owner, repo)
+
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := s.client.Do(ctx, req, nil)
+	if err != nil {
+		return resp, err
+	}
+
+	return resp, nil
+}
+
+// DisableImmutableReleases disables immutable releases for a repository.
+//
+// GitHub API docs: https://docs.github.com/rest/repos/repos#disable-immutable-releases
+//
+//meta:operation DELETE /repos/{owner}/{repo}/immutable-releases
+func (s *RepositoriesService) DisableImmutableReleases(ctx context.Context, owner, repo string) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/immutable-releases", owner, repo)
+
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := s.client.Do(ctx, req, nil)
+	if err != nil {
+		return resp, err
+	}
+
+	return resp, nil
+}
+
+// IsImmutableReleasesEnabled checks if immutable releases are enabled for
+// the repository.
+//
+// GitHub API docs: https://docs.github.com/rest/repos/repos#check-if-immutable-releases-are-enabled-for-a-repository
+//
+//meta:operation GET /repos/{owner}/{repo}/immutable-releases
+func (s *RepositoriesService) IsImmutableReleasesEnabled(ctx context.Context, owner, repo string) (*RepoImmutableReleasesStatus, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/immutable-releases", owner, repo)
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	status := new(RepoImmutableReleasesStatus)
+	resp, err := s.client.Do(ctx, req, status)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return status, resp, nil
+}
diff --git a/github/repos_immutable_releases_test.go b/github/repos_immutable_releases_test.go
new file mode 100644
index 00000000000..9a1a04f9f06
--- /dev/null
+++ b/github/repos_immutable_releases_test.go
@@ -0,0 +1,100 @@
+// Copyright 2026 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestRepositoriesService_EnableImmutableReleases(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	mux.HandleFunc("/repos/owner/repo/immutable-releases", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "PUT")
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	ctx := t.Context()
+	_, err := client.Repositories.EnableImmutableReleases(ctx, "owner", "repo")
+	if err != nil {
+		t.Errorf("Repositories.EnableImmutableReleases returned error: %v", err)
+	}
+
+	const methodName = "EnableImmutableReleases"
+	testBadOptions(t, methodName, func() (err error) {
+		_, err = client.Repositories.EnableImmutableReleases(ctx, "\n", "\n")
+		return err
+	})
+
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		return client.Repositories.EnableImmutableReleases(ctx, "owner", "repo")
+	})
+}
+
+func TestRepositoriesService_DisableImmutableReleases(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	mux.HandleFunc("/repos/owner/repo/immutable-releases", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "DELETE")
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	ctx := t.Context()
+	_, err := client.Repositories.DisableImmutableReleases(ctx, "owner", "repo")
+	if err != nil {
+		t.Errorf("Repositories.DisableImmutableReleases returned error: %v", err)
+	}
+
+	const methodName = "DisableImmutableReleases"
+	testBadOptions(t, methodName, func() (err error) {
+		_, err = client.Repositories.DisableImmutableReleases(ctx, "\n", "\n")
+		return err
+	})
+
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		return client.Repositories.DisableImmutableReleases(ctx, "owner", "repo")
+	})
+}
+
+func TestRepositoriesService_IsImmutableReleasesEnabled(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	mux.HandleFunc("/repos/owner/repo/immutable-releases", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `{"enabled": true, "enforced_by_owner": false}`)
+	})
+
+	ctx := t.Context()
+	status, _, err := client.Repositories.IsImmutableReleasesEnabled(ctx, "owner", "repo")
+	if err != nil {
+		t.Errorf("Repositories.IsImmutableReleasesEnabled returned error: %v", err)
+	}
+	want := &RepoImmutableReleasesStatus{Enabled: Ptr(true), EnforcedByOwner: Ptr(false)}
+	if !cmp.Equal(status, want) {
+		t.Errorf("Repositories.IsImmutableReleasesEnabled returned %+v, want %+v", status, want)
+	}
+
+	const methodName = "IsImmutableReleasesEnabled"
+	testBadOptions(t, methodName, func() (err error) {
+		_, _, err = client.Repositories.IsImmutableReleasesEnabled(ctx, "\n", "\n")
+		return err
+	})
+
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		got, resp, err := client.Repositories.IsImmutableReleasesEnabled(ctx, "owner", "repo")
+		if got != nil {
+			t.Errorf("testNewRequestAndDoFailure %v = %#v, want nil", methodName, got)
+		}
+		return resp, err
+	})
+}