Green Square is a precinct in the inner-east of Sydney, Australia, in the suburbs of Alexandria, Zetland, Waterloo, Rosebery and Beaconsfield. It is 4 km south of the Sydney central business district and is part of the local government area of the City of Sydney.

The centre of the Green Square precinct is at the junction of Bourke Road, Botany Road and O'Riordan Street. Green Square railway station on the Airport & South Line is located at this junction.

The area is predominantly light industrial, with a small amount of high-density residential development. The area is undergoing one of the largest urban renewal projects undertaken in Australia. The urban renewal area spans 292 hectares. According to the Lord Mayor, "Green Square will provide 20,000 new homes; 22,000 jobs; and house 40,000 new residents".