Melzar Avery (September 30, 1854 – June 19, 1939) was a Canadian politician.

Born in Junetown, Escott township, Leeds County, Canada West, the son of Isaac and Mary Avery, Avery was educated at the public School of Escott.

A lumber merchant, he was a member of the County Council of Frontenac for 14 years.

He was first elected to the House of Commons of Canada in a 1902 by-election for the Ontario electoral district of Addington.

A Conservative, he was re-elected in 1904 for the electoral district of Frontenac.