William S. Gillies (b. 1911, San Francisco – d. 2000) was an American artist, letterer and type designer working in New York City.
Gillies is best remembered as an illustrator for the covers of several books including the Ken Holt Mysteries, Nancy Drew Mysteries, and The Hardy Boys Mysteries. He also drew for Collier's Weekly magazine and Saturday Home magazine. He was also a gifted painter of portraits.
- MacGrew, Mac, American Metal Typefaces of the Twentieth Century, Oak Knoll Books, New Castle Delaware, 1993, ISBN 0-938768-34-4.
- Rollins, Carl Purlington "American Type Designers and Their Work" in Print, vol. 4, #1.
- Jaspert, W. Pincus, W. Turner Berry and A.F. Johnson. The Encyclopedia of Type Faces. Blandford Press Ltd.: 1953, 1983. ISBN 0-7137-1347-X.