Birrong, a suburb of local government area City of Canterbury-Bankstown, is located 22 kilometres south-west of the Sydney central business district, in the state of New South Wales, Australia, and is a part of the South-western Sydney region.

Birrong shares its postcode of 2143 with neighbouring suburbs Regents Park and Potts Hill.

The Aboriginal word Birrong, meaning star, was adopted as the suburb's name around 1927.

Birrong Park, an area that was subject to flooding, was drained as relief work during the Great Depression (1929–1934).

Other languages spoken at home included Vietnamese 19.8%, Arabic 18.4%, Mandarin 7.4% and Cantonese 4.4%.