William Barnes Wollen RI ROI (6 October 1857 – 28 March 1936) was an English painter mostly known for his paintings of battle and historical scenes and sporting events.

He was elected a member of the Royal Institute of Painters in Water Colours in 1888.

In 1900, he was commissioned by the new illustrated weekly newspaper, The Sphere to act as one of its special artists in South Africa to cover the Boer War.

His experiences during this war resulted in several paintings including "The Imperial Light Horse at Waggon Hill, January 6, 1900", "The Victoria Cross", and "The 1st Battalion South Lancashire Regiment storming the Boer trenches at Pieter's Hill".

The artist also exhibited several scenes during and shortly after World War I depicting that conflict.