The Steam Wheel Tank was a U.S.-produced, prototype armoured fighting vehicle built by the Holt Manufacturing Company (now Caterpillar Inc.).

The prototype was completed in February 1918 and was evaluated between March and May 1918 at Aberdeen Proving Ground.

Although it is often assumed that the vehicle was a tadpole configuration (with two driving wheels at the front), a senior Holt executive and the Aberdeen Proving Ground's report state that it was a delta configuration (with the large wheels at the rear), and that the vehicle drove like a conventional agricultural tractor.

The rear wheels were made from pressed-steel sheet, the same as those used on Holt agricultural machinery of the period.

The vehicle's armament comprised 2 6-pounder (57 mm) cannons, mounted in sponsons, and two machine guns.