The Sepang District is a district located in the southern part of the state of Selangor in Malaysia. Sepang District covers an area of around 600 square kilometres, and had a population of 190,889 in the 2010 Census.

Selangor, also known by the Arabic honorific Darul Ehsan, or "Abode of Sincerity", is one of the 13 states of Malaysia. It is on the west coast of Peninsular Malaysia and is bordered by Perak to the north, Pahang to the east, Negeri Sembilan to the south, and the Strait of Malacca to the west. Selangor surrounds the federal territories of Kuala Lumpur and Putrajaya, both of which were previously part of it. Selangor has diverse tropical rainforests and an equatorial climate. The state's mountain ranges belong to the Titiwangsa Mountains, which is part of the Tenasserim Hills that covers southern Myanmar, southern Thailand and Peninsular Malaysia, with Mount Semangkok as the highest point in the state.