Stewart Ainsworth FSA, MCIfA (born 26 June 1951) is a British archaeological investigator who is regularly seen on Time Team the Channel 4 archaeological television series he joined in 1995. He has since appeared in over two hundred episodes. After reading, in his youth, a book about Horatio Nelson, 1st Viscount Nelson, and visiting the Tower of London, he formed an interest in the history of landscapes. As of 2010, Ainsworth has been affiliated with the history and archaeology department at the University of Chester, where he is a visiting professor.