The Mornington Peninsula is a peninsula located south of Melbourne, Victoria, Australia. It is surrounded by Port Phillip to the west, Western Port to the east and Bass Strait to the south, and is connected to the mainland in the north. Geographically, the peninsula begins its protrusion from the mainland in the area between Pearcedale and an area north of Frankston. The area was originally home to the Mayone-bulluk and Boonwurrung-Balluk clans, and formed part of the Boonwurrung nation's territory prior to European settlement.

Point Nepean marks the southern point of The Rip and the most westerly point of the Mornington Peninsula, in Victoria, Australia. It was named in 1802 after the British politician and colonial administrator Sir Evan Nepean by John Murray in HMS Lady Nelson. Its coast and adjacent waters are included in the Port Phillip Heads Marine National Park, while its land area is part of the Point Nepean National Park. The point includes Cheviot Beach on its southern side, notable as the site of the disappearance in 1967 of Australia's then-Prime Minister Harold Holt.