Gilbert Vaughn Hemsley Jr. (1936–1983) was a noted United States lighting designer and teacher of lighting design.
He was born in Bridgeport, Connecticut.
Hemsley studied history at Yale, earned an MFA at Yale Drama School in 1960, and worked as assistant to lighting designer Jean Rosenthal.
He was production manager for the inaugurations of U.S. Presidents Richard Nixon and Jimmy Carter, but he is best known for his work as a lighting designer on Broadway, at numerous regional theatres, and as the lighting director at the New York City Opera. Hemsley taught lighting design at the University of Wisconsin–Madison and was celebrated there for his generosity with students, many of whom served as assistants at New York City Opera and elsewhere.
He died in 1983.