William Marshall is a named shared by several people:

• William Marshal, father and son, 12th-to-13th-century British noblemen
• William Marshall (illustrator) the 17th-century illustrator
• William Calder Marshall , the 19th-century Scottish sculptor
• William Raine Marshall, the 19th-century American politician
• William Marshall (commander) the 20th-century military commander
• William Marshall (film) the film director and producer (and actor?)