William Terriss (20 February 1847 – 16 December 1897), born as William Charles James Lewin, was an English actor, known for his swashbuckling hero roles, such as Robin Hood, as well as parts in classic dramas and comedies. He was also a notable Shakespearean performer. He was the father of the Edwardian musical comedy star Ellaline Terriss and the film director Tom Terriss.
Athletic as a child, Terriss briefly joined the merchant navy and tried several professions abroad and at home. Adopting the stage name William Terriss, he made his first stage appearance in 1868 and was first in the West End in Tom Robertson's Society in 1871. In the same year he had major successes in Robin Hood and Rebecca and quickly established himself as one of Britain's most popular actors. In 1880, he joined Henry Irving's company at the Lyceum Theatre, appearing in Shakespeare plays.
In 1885, he met 24-year-old Jessie Millward, with whom he starred in The Harbour Lights by G. R. Sims and Henry Pettitt. They toured Britain and America together. Terriss played the hero parts in Adelphi melodramas from the late 1880s, among other roles. In 1897, he was stabbed to death by a deranged actor, Richard Archer Prince, at the stage door of the Adelphi Theatre, where he was appearing. Terriss's ghost is supposed to haunt Covent Garden tube station and the Adelphi Theatre.