Main Ridge is a rural locality south of Melbourne, Victoria, Australia, south of and inland from Rosebud on the Mornington Peninsula, originally known as Main Creek. Its local government area is the Shire of Mornington Peninsula. At the 2011 census, Main Ridge had a population of 469.
The district consists of the western spine of Arthurs Seat and the southern hinterlands. A R & F Ditterich Reserve, containing a hall, picnic and sports facilities, and the nearby CFA are the main facilities in the district, while several wineries such as Poplar Bend and Ryland River are located here.
The southern part of the locality, alongside Main Creek, is part of the Mornington Peninsula National Park called Greens Bush, a native bushland area first set aside for conservation in 1974 and supporting the largest population of eastern grey kangaroos on the Mornington Peninsula. Several walking tracks provide access to the area.