Hulu Selangor is a district in Selangor, Malaysia. It contains the towns of Serendah, Batang Kali and Kuala Kubu Bharu. Its principal town is Kuala Kubu Bharu. The district is located in the northeastern part of Selangor and borders the state of Perak to the north, Pahang to the east, Sabak Bernam district to the northwest, Kuala Selangor district to its southwest and Gombak district to the south. Selangor River sources from this area, hence giving the district's name.

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.