Henry Gilbert Irwin (born March 21, 1925) was a political figure in New Brunswick, Canada. He represented Charlotte County in the Legislative Assembly of New Brunswick from 1960 to 1967 as a Liberal member.
He was born in Chamcook, New Brunswick, the son of George Lawson Irwin and Mary Craig. Irwin was educated at the University of New Brunswick. In 1953, he married Madeline Maclean Meating. He served on the town council for Saint Andrews, New Brunswick. Irwin was an unsuccessful candidate for a seat in the provincial assembly in 1956. He served as Minister of Education from 1960 to 1966. Irwin was chief electoral officer for the province in 1991