William Ware Theiss

William Ware Theiss (November 20, 1931 – December 15, 1992), also called Bill Theiss, was a 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.

Theiss was born in Medford, Massachusetts, the son of Harold Hetherington Theiss and Helen Theiss, and was named for his paternal grandfather, William Hodgson, and his paternal grandmother's family, Ellen (Ware) Hodgson. He attended Lowell High School in San Francisco and graduated from Stanford University with a Bachelor of Arts as an art major, minoring in sciences, biology and chemistry before a four-year stint in the United States Navy. He eventually moved to Los Angeles and attended Art Center for eight semesters. His first Hollywood job was as a personal secretary to Cary Grant, whose ex-wife, actress Dyan Cannon, Theiss cited as having considerable influence on his career.