Benajah Mallory (ca 1764 – August 9, 1853) was a farmer, merchant and political figure in Upper Canada.
He was born in the Thirteen Colonies around 1764; he was living in Vermont at the start of the American Revolution and served with the local militia. He married Abia Dayton and settled in Burford Township in Upper Canada with his father-in-law and others. When his father-in-law died, he became the community's leader. In 1798, he became a captain in the York militia. He was elected to the 4th Parliament of Upper Canada representing Norfolk, Oxford and Middlesex in 1804 and was elected to the following parliament for Oxford and Middlesex. In 1806, he was appointed justice of the peace in the London District. In 1812, with Joseph Willcocks, he resisted efforts by Isaac Brock to pass legislation preparing for war with the United States. After Brock dissolved parliament, Mallory was defeated by Mahlon Burwell in the subsequent election.