Hurtle Square, also known as Tangkaira, is one of five public squares in the Adelaide city centre, South Australia. Located in the centre of the south-eastern quarter of the city, it surrounds the intersection of Halifax and Pulteney Streets. Its north edge is bounded by Carrington Street.

It is one of six squares designed by the founder of Adelaide, Colonel William Light, who was Surveyor-General at the time, in his 1837 plan of the City of Adelaide which spanned the River Torrens Valley, comprising the city centre (South Adelaide) and North Adelaide. The square was named in 1837 by the Street Naming Committee after James Hurtle Fisher, South Australia's first Resident Commissioner. In 2003, as part of the dual naming initiative by the Adelaide City Council, a second name, Tangkaira, was assigned in the Kaurna language of the original inhabitants.