Mary Grant Price (20 February 1917 – 2 March 2002) was an American costume designer of Welsh birth who worked in theatre and film. She worked professionally under the name Mary Grant. She began her career on Broadway in the mid-1930s, first as an assistant to Raoul Pene Du Bois, and later as a lead designer during the 1940s. In 1943 she began working in film and spent much of the 1940s and 1950s designing costumes for Hollywood motion pictures. She was a member of the Academy of Motion Picture Arts and Sciences.