Negeri Sembilan (Malay pronunciation: [ˈnəgəri səmbiˈlan]), one of Malaysia's thirteen states, lies on the western coast of Peninsular Malaysia, just south of Kuala Lumpur and borders Selangor on the north, Pahang in the east, and Malacca and Johor to the south.

The name is believed to derive from the nine (sembilan) villages or nagari in the Minangkabau language (now known as luak) settled by the Minangkabau, a people originally from West Sumatra (in present-day Indonesia). Minangkabau features are still visible today in traditional architecture and the dialect of Malay spoken.

Unlike the hereditary monarchs of the other royal Malay states, the ruler of Negeri Sembilan is known as Yang di-Pertuan Besar instead of Sultan. The election of the Ruler is also unique. He is selected by the council of Undangs who lead the four biggest districts of Sungai Ujong, Jelebu, Johol, and Rembau, making it one of the more democratic monarchies.

The capital of Negeri Sembilan is Seremban. The royal capital is Seri Menanti in the district of Kuala Pilah. Other important towns are Port Dickson and Nilai.