Petersham is a suburb in the Inner West of Sydney, in the state of New South Wales, Australia. Petersham is located 6 kilometres south-west of the Sydney central business district, in the local government area of Inner West Council. Petersham is known for its extensive Portuguese commercial offerings, with many Portuguese businesses and restaurants, although only 151 (2%) of the population was actually born in Portugal and only 3.2% indicating Portuguese ancestry.
Petersham is bordered by the suburbs of Leichhardt to the north, Stanmore to the east, Marrickville to the south and Lewisham to the west. Taverners Hill, named after Fred Taverner, is a locality in the western part of the suburb.