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 kilometers, and had an estimated population of 338,600 in 2023.

The district of Sepang is also famous for the township of Cyberjaya, which is also known as the Silicon Valley of Malaysia due to its association with MSC Malaysia. The capital of Sepang district is Salak Tinggi, which took over from Sepang town.^{[citation needed]}

The remaining areas of Puchong, such as Bukit Puchong 2, 16 Sierra, Pulau Meranti, Bandar Nusaputra, Taman Putra Perdana, Taman Putra Prima, Taman Meranti Jaya and Taman Mas, are located in this district.

Some parts of Kajang such as Kampung Sungai Merab, Desa Pinggiran Putra and Kampung Dato Abu Bakar Baginda are also located in the northeast of the district.

Sepang district was formed from parts of the adjacent constituencies of Hulu Langat (Kajang) and Kuala Langat on 1 January 1975; though there was already a Sepang constituency in parliament as early as 1959. Sepang gained municipal status in 2005.

Sepang district is situated in the southern part of Selangor. It shares its border with Kuala Langat to the west, Petaling to the north, Hulu Langat to the northeast and the state of Negeri Sembilan to the east. Sepang also completely surrounds Putrajaya which is a Federal Territory.

Sepang District is divided into three mukims:

List of Sepang district representatives in the Federal Parliament (Dewan Rakyat)