Mount Vernon is a suburb of Sydney, in the state of New South Wales, Australia.

Mount Vernon is 42 kilometres west of the Sydney central business district, in the local government area of the City of Penrith and is part of the Greater Western Sydney region.

Mount Vernon is a sparsely populated rural suburb providing a close community atmosphere for its residents.

Mount Vernon takes its name from the land granted in 1820 to Anthony Fenn Kemp (1773–1868).

It was presumably named after Mount Vernon, George Washington's home in Virginia in the United States of America.