John Lambert could refer to:

• John Lambert (General), Parliamentary general in the English Civil War.
• John Lambert (Protestant martyr), English Protestant martyred during the reign of Mary I.
• John Lambert (politician) (1746-1823), U.S. senator from and Acting Governor of New Jersey
• John Lambert (traveler), English painter and author who travelled through Lower Canada and the U.S. from 1806 to 1809.
• Jack Lambert (American football player).

John Lambert (homonymie)