The Laxey Wheel (also known as Lady Isabella) is a large waterwheel built into the hillside above the village of Laxey in the Isle of Man. Designed by Robert Casement, the wheel has a 72-foot-6-inch (22.1 m) diameter, is 6 feet (1.8 m) wide and revolves at approximately three revolutions per minute.

A water-powered wheel was used because the Isle of Man does not have a supply of coal for a steam-powered pump.

It was built in 1854 to pump water from the Glen Mooar part of the Great Laxey Mines industrial complex. It was named "Lady Isabella" after the wife of Lieutenant Governor Charles Hope, who was the island's governor at that time. The 150th anniversary of the Lady Isabella was celebrated by the people of Laxey with a grand fayre on Saturday 24 September 2004. It is currently maintained by Manx National Heritage as part of the Great Laxey Wheel & Mines Trail.

The wheel features today on the reverse side of the £20 notes issued by the Isle of Man Government.

More Info: en.wikipedia.org