Marcus John Marshall (born 25 November 1978[1]) is a former Champ Car driver from Australia.

A lack of experience blighted his year and he scored only two top-ten finishes, the best of which was 8th in Edmonton.

He was fired and replaced by Will Power prior to the season finale in Mexico City after what was described as a "serious breach of contract".

On 12 February 2006 Marshall raced for A1 Team Australia in round 8 of the A1 Grand Prix series at the Sentul International Circuit in Indonesia and finished third in the feature race, behind Canadian Sean McIntosh and Malaysian Alex Yoong.

After six races financial issues forced the team to cease operations.