John Hannah may refer to:

• John Hannah (actor) (born 1962), Scottish actor
• John Hannah (American football) (born 1951), American football player
• John Hannah (footballer) (born 1962), English football forward
• John Hannah (VC) (1921–1947), Scottish RAF radio operator
• John Hannah (Methodist), called the elder (1792–1867), English Wesleyan minister.
• John Hannah (Archdeacon of Lewes), the younger, (1818–1888), his son, Anglican priest and schoolmaster
• John Hannah (Dean of Chichester) (1843–1931), his son, Anglican priest
• John A. Hannah (1902–1991), American academic administrator and head of USAID
• John D. Hannah (born c. 1940s), American academic
• John H. Hannah Jr. (1939–2003), U.S. federal judge
• John P. Hannah (born 1962), American government administrator