William Wegman (b. 1943 in Holyoke, Massachusetts) is an artist best known for creating series of compositions involving dogs, primarily his own Weimaraners in various costumes and poses.

Wegman reportedly originally intended to pursue a career as a painter. He received a Bachelor of Fine Arts in painting from Massachusetts College of Art in 1965 and a Master of Fine Arts degree in painting from the University of Illinois at Urbana-Champaign in 1967.

While teaching at California State University, Long Beach, he acquired the first and most famous of the dogs he photographed, a Weimaraner he named Man Ray (after the artist and photographer). Man Ray later became so popular that the Village Voice named him "Man of the Year" in 1982. He named a subsequent dog Fay Ray (a play on the name of actress Fay Wray).