Abbé Pierre Antoine Simon Maillard (c. 1710 – 12 August 1762) was a French-born Roman Catholic priest. He is noted for his contributions to the creation of a writing system for the Mi'kmaq indigenous people of Île Royale, Cape Breton Island, Canada. He is also credited with helping negotiate a peace treaty between the British and Mi'kmaq people, which resulted in the Burying the Hatchet Ceremony (Nova Scotia). He was the first Catholic priest in Halifax and is buried in the St. Peter's Cemetery in downtown Halifax.