Tunku Ampuan Najihah binti Almarhum Tunku Besar Burhanuddin (Jawi: تونكو امڤوان ناجحة بنت المرحوم تونكو بسر برهان الدين; born 1 September 1923) is the Tunku Ampuan of Negeri Sembilan. She was formerly the Tunku Ampuan Besar or Queen of Negeri Sembilan from 1967 to 2008. She also served as Raja Permaisuri Agong of Malaysia between 1994 and 1999.