St George's Channel is a channel between Wales and Ireland, connecting the Irish Sea to the North and the Atlantic Ocean (the Celtic Sea) to the South. It is 100 miles (160 km) long and 50-90 miles (81–145 km) wide.

The name is said to derive from a 14th Century legend that Saint George had voyaged to England from Turkey. The legend said he approached Britain via the channel that bears his name.