| Joseph-Séraphin-Aimé Ashby | |
| Office: | Member of the Legislative Assembly of Quebec for Jacques-Cartier |
| Predecessor: | Philémon Cousineau |
| Successor: | Esioff-Léon Patenaude |
| Term Start: | 1916 |
| Term End: | 1923 |
| Birth Date: | 29 April 1876 |
| Birth Place: | Sainte-Marie-de-Monnoir, Quebec |
| Death Place: | Montreal, Quebec |
| Party: | Liberal |
Joseph-Séraphin-Aimé Ashby (April 29, 1876 - March 5, 1962) was a Canadian politician in the province of Quebec.
Born in Sainte-Marie-de-Monnoir, Quebec, the son of George Ashby and Euphrosine Messier, Ashby was educated at the college of Sainte-Marie-de-Monnoir and the Université Laval at Montreal. He became a notary public in 1904 and practice in Lachine. He was elected to the Legislative Assembly of Quebec for the electoral district of Jacques-Cartier in the 1916 election. A Quebec Liberal, he was re-elected in the 1919 election and was defeated in the 1923 election. From 1923 to 1925, he was mayor of Lachine.