Selangor 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.

The state capital of Selangor is Shah Alam and its royal capital is Klang, while Petaling Jaya is the largest city. Petaling Jaya and Subang Jaya received city status in 2006 and 2019, respectively. Selangor is one of four Malaysian states that contain more than one city with official city status; the others are Sarawak, Johor, and Penang.

The state of Selangor has the largest economy in Malaysia in terms of gross domestic product (GDP), with RM 239.968 billion (roughly US$55.5 billion) in 2015, comprising 22.60% of the country’s GDP. It is the most developed state in Malaysia; it has good infrastructure such as highways and transport, and has the largest population in Malaysia, a high standard of living and the lowest poverty rate in the country.