The flag of Chile consists of two equal-height horizontal bands of white and red, with a blue square the same height as the white band in the canton, which bears a white five-pointed star in the center. It was adopted on 18 October 1817. The Chilean flag is also known in Spanish as La Estrella Solitaria. It is the only flag in South America whose design was influenced by the flag of the United States.

In vexillography, the canton is a rectangular emblem placed at the top left of a flag, usually occupying up to a quarter of a flag's area. The canton of a flag may be a flag in its own right. For instance, British ensigns have the Union Jack as their canton, as do their derivatives such as the national flags of Australia and New Zealand.