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

The district is located in the outer south-western suburbs of Perth.

Warnbro was won by Labor MP Paul Papalia, who was previously the member for Peel.

Warnbro is a coastal electorate situated in the south-western corner of the Metropolitan Region Scheme.

It takes in the suburbs of Warnbro, Port Kennedy, Secret Harbour, Golden Bay, Karnup, Singleton, as well as parts of Baldivis and Waikiki.