Portarlington ( ), a historic coastal township located on the Bellarine Peninsula, 27km from the city of Geelong, in the state of Victoria, Australia. The gently rising hills behind the town feature vineyards and olive groves, overlooking Port Phillip Bay. Portarlington is a popular family holiday destination and a centre of fishing and aquaculture (mussels). At one time the town claimed the largest caravan park in the Southern Hemisphere, although the size has reduced considerably in recent decades. At the 2001 census, Portarlington had a population of 3021.

In 2002, the Victorian Coastal Strategy report named Portarlington as a potential site for a multi-million dollar Safe Harbour development on the Bellarine Peninsula. In December 2005, private independent consultants delivered a feasibility study which identified Portarlington as the preferred site for the development .