The Darling Harbour ferry service (numbered F4, coloured green) 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 Lavender Bay and Darling Harbour areas. First Fleet and HarbourCat ferries usually operate the service.

Originally created to promote tourist and traveller pilgrimage to the Darling Harbour precinct after its redevelopment in the 1980s, the route first consisted of stops at McMahons Point, Balmain East and Sydney Aquarium. Additional stops at Milsons Point, Balmain and Pyrmont were included on the route in the early 2000s, however, Balmain was later removed from the route and an inquiry into Sydney Ferries in 2007 advised the creation of a new terminal at Darling Harbour be built. The current route terminates at Darling Harbour.

After the redevelopment of the Darling Harbour precinct in the 1980s until the late 1990s, the area was serviced by public transport with only one wharf, the Aquarium ferry wharf; adjacent to the Sydney Aquarium. The wharf was opened as part of an initiative to promote pilgrimage to the new Darling Harbour precinct and its new attractions, such as the Aquarium. It also coincided with the opening of the Sydney Monorail loop from Town Hall to Darling Harbour. Routes from Circular Quay to Aquarium and vice versa usually included stops at Darling Street Balmain / Balmain East and McMahons Point. Following the opening of the Milsons Point and Pyrmont Bay wharves in the late 90s, Darling Harbour ferries also included these stops, with Pyrmont Bay being the terminus of the route. Balmain was also included on the route after timetable changes in April 2002, as a stop between Balmain East and Aquarium. After July 2008 timetable changes, the route was briefly split into two terminuses, with Balmain East serving as a junction between a route to Balmain and a Route to Pyrmont Bay.

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