The Western Australian Legislative Assembly, or lower house, is one of the two chambers of the Parliament of Western Australia, an Australian state. The Parliament sits in Parliament House in the Western Australian capital, Perth.

The Parliament of Western Australia is the bicameral legislature of the Australian state of Western Australia, which constitutes the legislative branch of the state's political system. The parliament consists of the King, the Legislative Council and the Legislative Assembly. The two Houses of Parliament sit in Parliament House in the state capital, Perth.