The Crooked House was a pub in South Staffordshire, England. Its name and distinctive appearance were the result of 19th-century mining subsidence which caused one side of the building to be approximately 4 feet (1.2 m) lower than the other. It was known as "Britain's wonkiest pub", and optical illusions inside the building made objects appear to roll uphill.

Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities. Subsidence involves little or no horizontal movement, which distinguishes it from slope movement.