The Cockatoo Island ferry service, officially known as F8 Cockatoo Island, is a commuter ferry service in Sydney, New South Wales. Part of the Sydney Ferries network, it is operated by Harbour City Ferries and services the Balmain Peninsula, Greenwich, Woolwich, and Cockatoo Island areas of Sydney Harbour. Consisting six stops, the service partially traverses the former Balmain / Woolwich ferry service, which operated from 1992 to 2013. The service was introduced on 26 November 2017, as part of timetable changes across the Transport for NSW network in 2017. It replaced the Woolwich stopping pattern on the F3 Parramatta River service.

A ferry service servicing a Balmain-Cockatoo Island-Woolwich route had been in existence since at least 1992, when a service stopping at Balmain East (then known as Darling Street wharf), Birchgrove (Longnose Point wharf), and continuing on to Woolwich co-existed with a Balmain-only service that stopped at the Darling Street wharf, Balmain (Thames Street wharf), and Balmain West (Elliot Street wharf). By 2006, the two routes were merged to form a singular service known as the "Balmain / Woolwich" service, coded orange and including stops at Milsons Point, McMahons Point, and Birkenhead, the latter of which was introduced to the preceding Balmain-only route in 1995. In 2008, the service was extended to Drummoyne. With the timetable changes on 10 October 2010, Birkenhead was decommissioned from service following low patronage numbers, pushing the route's Balmain terminus back to Balmain West. In 2011, services to Balmain West were limited to weekdays only.

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