diff --git a/users.go b/users.go
index ed37a19..ab52195 100644
--- a/users.go
+++ b/users.go
@@ -88,6 +88,12 @@ func (s *UserService) IterBlockedUsers(ctx context.Context) iter.Seq2[types.Bloc
 	return ListIter[types.BlockedUser](ctx, s.client, "/api/v1/user/list_blocked", nil)
 }
 
+// Block blocks a user as the authenticated user.
+func (s *UserService) Block(ctx context.Context, username string) error {
+	path := ResolvePath("/api/v1/user/block/{username}", pathParams("username", username))
+	return s.client.Put(ctx, path, nil, nil)
+}
+
 // ListMySubscriptions returns all repositories watched by the authenticated user.
 func (s *UserService) ListMySubscriptions(ctx context.Context) ([]types.Repository, error) {
 	return ListAll[types.Repository](ctx, s.client, "/api/v1/user/subscriptions", nil)
diff --git a/users_test.go b/users_test.go
index a0ebdc4..704e231 100644
--- a/users_test.go
+++ b/users_test.go
@@ -141,6 +141,24 @@ func TestUserService_ListBlockedUsers_Good(t *testing.T) {
 	}
 }
 
+func TestUserService_Block_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/user/block/alice" {
+			t.Errorf("wrong path: %s", r.URL.Path)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	defer srv.Close()
+
+	f := NewForge(srv.URL, "tok")
+	if err := f.Users.Block(context.Background(), "alice"); err != nil {
+		t.Fatal(err)
+	}
+}
+
 func TestUserService_IterBlockedUsers_Good(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.Method != http.MethodGet {