The Selangor State Legislative Assembly (Malay: Dewan Negeri Selangor) is the unicameral state legislature of the Malaysian state of Selangor. The State Assembly is composed of 56 members representing single-member constituencies throughout the state. Elections are held no more than five years apart, and by Malaysian political convention, are conducted simultaneously with elections to the federal parliament and other state assemblies (except Sabah and Sarawak).

It convenes at the Sultan Salahuddin Abdul Aziz Shah Building in the capital Shah Alam. Since 2008, Assembly proceedings have been broadcast live on the internet.^[2]

As the state's legislative body, the Selangor State Legislative Assembly's main function is to enact laws that apply to Selangor, known as enactments. The Speaker presides over the Assembly's proceedings, and works to maintain order during debates. The present Speaker is Lau Weng San of the Democratic Action Party (DAP) and the Pakatan Harapan (PH) coalition.

The state government's executive branch (known as the Selangor State Executive Council (EXCO), or Majlis Mesyuarat Kerajaan Negeri), including the Menteri Besar, are drawn from the Assembly. The Menteri Besar is ceremonially appointed by the Sultan of Selangor on the basis that he is able to command a majority in the Assembly. The Menteri Besar then appoints members of the State EXCO drawing from members of the Assembly.

The following is the Speaker of the Selangor State Legislative Assembly Roll of Honour, since 1959:

The 2023 Selangor state election witnessed 34 governmental seats and 22 non-governmental seats fill the Selangor State Legislative Assembly. The government side has 16 safe seats and 8 fairly safe seats, while the non-government side has 6 fairly safe seats.