diff --git a/issues.go b/issues.go
index daacbf4..098c565 100644
--- a/issues.go
+++ b/issues.go
@@ -118,6 +118,40 @@ func (s *IssueService) CreateComment(ctx context.Context, owner, repo string, in
 	return &out, nil
 }
 
+// ListSubscriptions returns all users subscribed to an issue.
+func (s *IssueService) ListSubscriptions(ctx context.Context, owner, repo string, index int64) ([]types.User, error) {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions", pathParams("owner", owner, "repo", repo, "index", int64String(index)))
+	return ListAll[types.User](ctx, s.client, path, nil)
+}
+
+// IterSubscriptions returns an iterator over all users subscribed to an issue.
+func (s *IssueService) IterSubscriptions(ctx context.Context, owner, repo string, index int64) iter.Seq2[types.User, error] {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions", pathParams("owner", owner, "repo", repo, "index", int64String(index)))
+	return ListIter[types.User](ctx, s.client, path, nil)
+}
+
+// CheckSubscription returns the authenticated user's subscription state for an issue.
+func (s *IssueService) CheckSubscription(ctx context.Context, owner, repo string, index int64) (*types.WatchInfo, error) {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions/check", pathParams("owner", owner, "repo", repo, "index", int64String(index)))
+	var out types.WatchInfo
+	if err := s.client.Get(ctx, path, &out); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
+// SubscribeUser subscribes a user to an issue.
+func (s *IssueService) SubscribeUser(ctx context.Context, owner, repo string, index int64, user string) error {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions/{user}", pathParams("owner", owner, "repo", repo, "index", int64String(index), "user", user))
+	return s.client.Put(ctx, path, nil, nil)
+}
+
+// UnsubscribeUser unsubscribes a user from an issue.
+func (s *IssueService) UnsubscribeUser(ctx context.Context, owner, repo string, index int64, user string) error {
+	path := ResolvePath("/api/v1/repos/{owner}/{repo}/issues/{index}/subscriptions/{user}", pathParams("owner", owner, "repo", repo, "index", int64String(index), "user", user))
+	return s.client.Delete(ctx, path)
+}
+
 // toAnySlice converts a slice of int64 to a slice of any for IssueLabelsOption.
 func toAnySlice(ids []int64) []any {
 	out := make([]any, len(ids))
diff --git a/issues_test.go b/issues_test.go
index 42955a3..b7ada8b 100644
--- a/issues_test.go
+++ b/issues_test.go
@@ -5,6 +5,7 @@ import (
 	json "github.com/goccy/go-json"
 	"net/http"
 	"net/http/httptest"
+	"reflect"
 	"testing"
 
 	"dappco.re/go/core/forge/types"
@@ -168,6 +169,126 @@ func TestIssueService_CreateComment_Good(t *testing.T) {
 	}
 }
 
+func TestIssueService_ListSubscriptions_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/subscriptions" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("X-Total-Count", "2")
+		json.NewEncoder(w).Encode([]types.User{
+			{ID: 1, UserName: "alice"},
+			{ID: 2, UserName: "bob"},
+		})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	users, err := f.Issues.ListSubscriptions(context.Background(), "core", "go-forge", 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(users, []types.User{{ID: 1, UserName: "alice"}, {ID: 2, UserName: "bob"}}) {
+		t.Fatalf("got %#v", users)
+	}
+}
+
+func TestIssueService_IterSubscriptions_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/subscriptions" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		w.Header().Set("X-Total-Count", "1")
+		json.NewEncoder(w).Encode([]types.User{{ID: 1, UserName: "alice"}})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	var seen []types.User
+	for user, err := range f.Issues.IterSubscriptions(context.Background(), "core", "go-forge", 1) {
+		if err != nil {
+			t.Fatal(err)
+		}
+		seen = append(seen, user)
+	}
+	if !reflect.DeepEqual(seen, []types.User{{ID: 1, UserName: "alice"}}) {
+		t.Fatalf("got %#v", seen)
+	}
+}
+
+func TestIssueService_CheckSubscription_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Errorf("expected GET, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/subscriptions/check" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		json.NewEncoder(w).Encode(types.WatchInfo{Subscribed: true, Ignored: false})
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	result, err := f.Issues.CheckSubscription(context.Background(), "core", "go-forge", 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !result.Subscribed || result.Ignored {
+		t.Fatalf("got %#v", result)
+	}
+}
+
+func TestIssueService_SubscribeUser_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPut {
+			t.Errorf("expected PUT, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/subscriptions/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		w.WriteHeader(http.StatusCreated)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	if err := f.Issues.SubscribeUser(context.Background(), "core", "go-forge", 1, "alice"); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestIssueService_UnsubscribeUser_Good(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodDelete {
+			t.Errorf("expected DELETE, got %s", r.Method)
+		}
+		if r.URL.Path != "/api/v1/repos/core/go-forge/issues/1/subscriptions/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	if err := f.Issues.UnsubscribeUser(context.Background(), "core", "go-forge", 1, "alice"); err != nil {
+		t.Fatal(err)
+	}
+}
+
 func TestIssueService_Pin_Good(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodPost {