Ian Davidson may refer to:

• Ian Davidson (footballer, born 1947), English footballer
• Ian Davidson (footballer, born 1937), Scottish footballer
• Ian Davidson (British politician) (born 1950), former Scottish Labour Co-operative MP
• Ian Davidson (South African politician) (born 1951), South African Democratic Alliance MP
• Ian Davidson (scriptwriter), comedy scriptwriter
• Ian Davidson (cricketer) (born 1964), English cricketer
• Ian Damon (Ian Davidson, born 1935), Australian broadcaster and disc jockey
• Ian Davidson (rugby player) (1877-1939), Irish rugby player