Mandurah () is a coastal city in the Australian state of Western Australia, situated approximately 72 kilometres (45 mi) south of the state capital, Perth. It is the state's second most populous city, with a population of approximately 117,000.
Mandurah's central business district is located on the Mandurah Estuary, which is an outlet for the Peel Inlet and Harvey Estuary. The city's name is derived from the Noongar word mandjar, meaning "meeting place" or "trading place". A townsite for Mandurah was laid out in 1831, two years after the establishment of the Swan River Colony, but attracted few residents, and until the post-war boom of the 1950s and 1960s it was little more than a small fishing village. In subsequent years, Mandurah's reputation for boating and fishing attracted many retirees, including to the canal developments in the city's south.