John Joseph McCartin (born 24 April 1939) is an Irish former Fine Gael politician who served as a Member of the European Parliament (MEP) for the Connacht–Ulster constituency from 1979 to 2004.

[1] He was born at Aughnasheelan, Ballinamore, County Leitrim, the son of small farmer Francis McCartin and his wife Annie Kate Lohan.

He founded the McCartin Bros group of companies with his brother Tommy; these had interests in Structural Steel, Clothing Manufacture, Milling, Forestry, Pig Production, and Dairy/Beef Farming.

McCartin joined Fine Gael as a teenager and became secretary of the Ballinamore District Executive at the age of seventeen.

In 2004, he was presented with the Schuman Medal at a meeting of the European Christian Democrats in Budapest, for "his outstanding contribution to peace and unity in Europe and for the promotion of the human values of mankind".