William Christian may refer to:

• William Christian (Manx) (1608–1663), also known as Illiam Dhone, Manx political leader
• William Christian (Virginia) (1743–1786), soldier on Virginia's western frontier, brother-in-law of Patrick Henry
• William Christian (Canadian political scientist) (born 1945), Canadian political scientist
• Bill Christian (born 1938), American Olympic ice hockey player
• William A. Christian (born 1944), American religious historian
• William Christian (actor), American actor