The Tattershall Castle is a paddle steamer which is now moored on the River Thames at the Embankment, and is used as a floating pub and restaurant.

The steamer was built in 1934 as a passenger ferry on the Humber estuary between Kingston-upon-Hull and New Holland. It was used as a tethering boat for barrage balloons during the Second World War. In 1981 the boat was towed to London after the errection of the Humber Bridge made its ferrying role on the Humber redundant.

The Tattershall Castle is probably named after Tattershall Castle in Lincolnshire.