Michael James S. Fish (born October 23, 1934) is a Canadian architect and urban conservationist, best known for his attempts to preserve heritage buildings in Montreal, Quebec, Canada.

Michael Fish began his career in Montreal in 1956, mostly involved in new apartment building construction.

[1] In 1970, Fish co-founded Friends of Windsor Station with architect Peter Lanken and urban-planning professor Jean-Claude Marsan.

[2] In the mid-1980s, he served as vice-president of the Canadian International Council of Monuments and Sites, a United Nations affiliate.

[3] After becoming more involved in political lobbying for marginalized groups, he found less and less work available to him from private developers, who saw conservationists as "a threat", according to him.