Louis O'Neill (April 25, 1925 – October 23, 2018) was a Canadian university professor, writer, priest and politician.
O'Neill studied at the Séminaire de Québec, Université Laval, Angelicum in Rome, and at the University of Strasbourg, in the fields of philosophy and theology.
He was a professor at various institutions, including Université Laval and the National University of Rwanda.
He co-wrote various works with Gérard Dion, including the 1956 manifesto L'immoralité politique dans la Province de Québec, a denunciation of "Duplessism".
He ran unsuccessfully for the Parti Québécois in Mercier in the 1973 Quebec general election, but won a seat in Chauveau in 1976.