Wanneroo is an electoral district of the Legislative Assembly in the Australian state of Western Australia.

Wanneroo is a traditionally a marginal seat; it has been held by the government of the day on every occasion since its creation in 1989.

However, at the 2021 state election, which resulted in a second consecutive landslide for Mark McGowan, the marginal trend was broken and Wanneroo became a very safe seat for the Labor Party.

Wanneroo is based in the outer northern suburbs of Perth.

It includes the suburbs of Ashby, Banksia Grove, Carramar, Gnangara, Hocking, Jandabup, Madeley, Mariginiup, Pearsall, Sinagra, Tapping, Wangara and Wanneroo.