T. O’Conor Sloane, Jr. (1879–1963) was a professional photographer.
He was born in 1879 in Brooklyn, New York but spent much of his adult life in Orange, New Jersey. Sloane, Jr. was already photographing by the summer of 1894, when he photographically documented a week-long cruise with his father on a sloop yacht on Long Island Sound. Pictures of this trip survive in an album he compiled that is now at the Mystic Seaport Museum (Mystic, Connecticut). Sloane, Jr. was most active as a naturalistic photographer at the turn of the twentieth century, garnering much acclaim for his gum bichromate work. In Sloane, Jr.’s early twenties, he focused primarily on portraiture, becoming a professional sometime thereafter.