Joseph-Arthur Denis (26 April 1881 – 1 October 1934) was a Liberal party member of the House of Commons of Canada. He was born in Saint-Norbert, Quebec in Berthier County and became a physician.
The son of Arsène Denis and Georgiana Laporte, Denis attended Joliette College, then Université Laval. He practised medicine at Notre-Dame-des-Bois and Montreal.
He was first elected to Parliament at the St. Denis riding in the 1921 general election then re-elected in 1925, 1926 and 1930. Denis died on 1 October 1934 before he was able to complete his fourth term, the 17th Canadian Parliament. His brother Azellus succeeded him as member for St. Denis.