He was born in New York City as William Norris Block. He was an actor, known for When Knighthood Was in Flower (1922), The Go-Getter (1923) and The Love Piker (1923). He was elected to The Lambs in 1892.
He married actress Mabel Mordaunt in Chicago in 1910. In 1906 they appeared together onstage in My Cinderella Girl. They had a son, William Norris, Jr.
He died on March 20, 1929 in West Bronxville, New York. He left his estate to the Lambs’ Memorial Relief Fund (forerunner of the Lambs Foundation), The Players, and the Actors’ Fund of America. For his generosity Norris was named an Immortal Lamb.