Four Square is a chain of supermarkets in New Zealand that was founded by John Heaton Barker. It has 230 stores throughout New Zealand, mostly in small towns. Some Four Square supermarkets previously operated in Australia under the name Friendly Grocer.

Sir Harry Heaton Barker was a New Zealand newspaper journalist and editor, local politician, and founder of the Four Square supermarket chain. He was mayor of Gisborne for 27 years.