Tunku Besar (Malay literally meaning "grand prince") is the title of the heir presumptive of the throne of Negeri Sembilan, Malaysia.
In ancient times it was also the title of the heir apparent of Melaka, Johor, Pahang (all in Malaysia) as well as several Malay sultanates in Sumatra, Indonesia.
Both Tunku Kurshiah and Tuanku Najihah also served a five-year term as Raja Permaisuri Agong or Queen of Malaysia.
His granddaughter, Tuanku Bahiyah, daughter of Tunku Kurshiah, was Sultanah of Kedah and also served a term as Raja Permaisuri Agong.
His grandson, Tuanku Muhriz, son of Tunku Ampuan Durah is the current Yang di-Pertuan Besar of Negeri Sembilan.