Mosman Bay Marina is a boutique, privately operated marina situated on Sydney Harbour at Mosman Bay, addressed at 1 Centenary Drive, Mosman, NSW.

The facility offers 35 berths accommodating vessels ranging from 8 to 30 metres in length, using a floating concrete pontoon system.

The marina caters to a wide variety of watercraft and provides berth-side power and water connections, a sewage pump-out facility, and a service jetty. It is described as a pre-eminent local boating destination on one of the world's most recognised harbours.