Joseph Alfred Ernest Roy
Member of the Canadian Parliament for Dorchester
In office 1908–1911
Preceded by	Jean-Baptiste Morin
Succeeded by	Albert Sévigny
Member of the Legislative Assembly of Quebec for Montmagny
In office 1900–1908
Preceded by	Joseph-Couillard Lislois
Succeeded by	Armand Lavergne
Personal details
Born	(1871-10-03)October 3, 1871 Saint-Vallier, Quebec
Died	August 17, 1928(1928-08-17) (aged 56) Saint-Michel, Quebec
Political party	Liberal

Joseph Alfred Ernest Roy (October 3, 1871 – August 17, 1928) was a Quebec lawyer, journalist, judge and political figure. He represented Montmagny in the Legislative Assembly of Quebec from 1900 to 1908, and Dorchester in the House of Commons of Canada as a Liberal member from 1908 to 1911. His name also appears as Ernest Roy.

Roy was born in Saint-Vallier, Quebec in 1871, the son of small landowner Nazaire Roy, and studied at the Séminaire de Québec and the Université Laval. He articled with Adélard Turgeon and also later served as his legal secretary. He was called to the bar in 1898 and set up practice at Quebec City, specializing in criminal law. In 1897, he had married Marie-Malvina Godbout. Roy was editor for the Courrier de Montmagny from 1900 to 1904. He was named King's Counsel in 1910. Roy was a member of the Quebec city council from 1914 to 1916. He served as whip for the federal Liberal party from 1909 to 1911. In 1924, he was named to the Quebec Superior Court.

He died at Saint-Michel in 1928.

• Joseph Alfred Ernest Roy – Parliament of Canada biography
• "Biography". Dictionnaire des parlementaires du Québec de 1792 à nos jours (in French). National Assembly of Quebec.