William Ware Theiss (/θaɪs/; November 20, 1931 – December 15, 1992), was an American costume designer for television and film. His film credits as costume designer include Spartacus, Harold and Maude, Bound for Glory, Pete's Dragon (uncredited), Who'll Stop the Rain, Butch and Sundance: The Early Days, The Man with One Red Shoe, and Heart Like a Wheel. His television credits include Star Trek and Star Trek: The Next Generation, for which he won an Emmy Award for Best Costume Design.