Secret Harbour is an electoral district of the Western Australian Legislative Assembly.
Secret Harbour is located in outer-metropolitan Perth, covering the vast majority of the former seat of Warnbro, which was renamed to Secret Harbour at the 2023 redistribution. Differing from its predecessor, Secret Harbour crosses the boundary of metropolitan Perth by taking in parts of the seat of Mandurah.
Secret Harbour was first contested at the 2025 state election with a notional margin for the Labor Party at 31.3% margin. Paul Papalia, the MP for the outgoing electorate of Warnbro was elected as Secret Harbour's inaugural member following the election.