The Manxman was a motorcycle designed and built by H. J. Hatch and Eric Walker of the Excelsior Motor Company in Tyseley, Birmingham.

Although it never won the Isle of Man TT, the Manxman was a very popular and reliable motorcycle which was successful in international racing and the Manx Grand Prix.

The Excelsior Motor Company did not make engines before World War II so Excelsior's Eric Walker worked in partnership with Blackburne's Ike Hatch, building on ideas developed by Rudge motorcycles on four valve engines to develop an entirely new twin camshaft design with pushrod operated valves that they called the 'mechanical marvel'.

The Manxman also became a popular choice for the independent TT racers or privateers who went on to achieve many wins until World War II stopped them racing.

[2] In 1937 the company developed a shorter-stroke 250 engine and an aluminium-alloy cylinder head with right-hand exhaust port.