Henry Avard Loomer (August 9, 1915 – July 18, 1969) was a Canadian manufacturing businessman and municipal politician who served as the mayor of Saint John, New Brunswick for just 26 days from June 22 to July 18, 1969, when he died in office.

[5] As mayor, he was featured in an article about Saint John's urban renewal project by The New York Times, where he shared an optimistic view on the future of Saint John and its port, being "confident that [Saint John] is in an idea position to attract container shipments.

"[6] His term in office was short-lived, serving as mayor for only 26 days until his death.

[8] On July 18, 1969, Loomer died at a hospital in Toronto, Ontario from a heart attack, two days after being admitted there for a physical examination.

[9][10] Following his death, his office was taken over by then-deputy mayor Arthur L. Gould,[11] until James E. Calvin was elected on October 6, 1969.