Westhaven Marina is the largest recreational marina in the Southern Hemisphere, situated on Auckland's Waitematā Harbour and owned by Auckland Council.

It holds nearly 2,000 berths and swing moorings and is home to four yacht clubs, a variety of marine businesses, and hospitality establishments.

Together with the nearby Viaduct and Silo marinas, it forms the greatest concentration of marina capacity in the Southern Hemisphere.

The marina offers a four-lane public boat ramp, a floating dock service, 100 metres of public-use pontoons, travel lifts, two boatyards, and two large-capacity slipways.

It is one of only three Auckland marinas approved as a place of first arrival for vessels clearing customs from overseas.

In 2014 the facility underwent a major rebuild, installing new Unifloat concrete pontoons fitted with Fibre Reinforced Polymer thru-rods for extended durability.