Ian Brennan may refer to:
Ian Brennan (cricketer) (born 1930), New Zealand cricketer Ian Brennan (footballer) (born 1953), English former footballer Ian Brennan (music producer) (born 1966), American music producer Ian Brennan (sculptor) (born 1950), British sculptor Ian Brennan (writer) (born 1978), American television writer, actor, producer and director