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.