William Falkner may refer to:

• William Faulkner (born William Cuthbert Falkner, 1897–1962), American author
• William Falkner (divine) (died 1682), English cleric with the Anglican Church
• William Clark Falkner (c. 1826–1889), American soldier, businessman, author and the great-grandfather of William Faulkner
• Bill Falkner, member of the Missouri House of Representatives

• William Faulkner (disambiguation)
• William Falconer (disambiguation)
• Falkner (disambiguation)