The Mornington Peninsula is a peninsula located south-east of Melbourne in Central 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 protrution from the mainland in the area between Pearcedale and Frankston. The area was originally home to the Mayone-bulluk clan and formed part of the Boonwurrung nation's territory prior to European settlement.

Much of the peninsula has been cleared for agriculture and settlements, however small areas of the native ecology remain in the peninsula's south and west, some of which is protected by the Mornington Peninsula National Park. Around 135,000 people live on the peninsula, most in the small towns on its western shorelines which are sometimes regarded as outlying suburbs of greater Melbourne. During the summer months, the population can swell to around 250,000 people.