Vincent McNabb, O.P. (8 July 1868 – 17 June 1943) was an Irish scholar and priest, based in London, active in evangelisation and apologetics.
McNabb was born in Portaferry, County Down, Ireland, the tenth of eleven children. He was educated during his schooldays at the diocesan seminary of St. Malachy's College, Belfast. On 10 November 1885 he joined the novitiate of the English Dominicans at Woodchester in Gloucestershire, England and was ordained in 1891. After studies at the University of Louvain (where he obtained in 1894 the degree of lector in Sacred Theology), he was sent to England where he served for the remainder of his life.
Fr. McNabb was a member of the Dominican order for 58 years and served as professor of philosophy at Hawkesyard Priory, prior at Woodchester, parish priest at St. Dominic's Priory, and prior and librarian at Holy Cross Priory, Leicester, as well as in various other official capacities for his Dominican province. Between 1929 and 1934, he lectured on the Summa Theologica of St. Thomas Aquinas under the auspices of the University of London External Lectures scheme. Tens of thousands of people heard him preach in Hyde Park, where he did not shy away from taking on all challengers — Protestants, atheists, and freethinkers — before vast crowds every Sunday, or heard him debate such luminaries as George Bernard Shaw in the city's theaters and conference halls on the burning social issues of the day.