Lonergan is a surname. Notable people with the surname include:Andrew Lonergan, English football player Arthur Lonergan (1906–1989), American art director Augustine Lonergan (1874–1947), American politician from Connecticut Bernard Lonergan, (1904–1984), Canadian Jesuit priest, philosopher-theologian, economist Dan Lonergan, Australian sports commentator and writer Dean Lonergan, New Zealand rugby league player and events promoter Dylan Lonergan, American football player Frank J. Lonergan (1882–1961), American politician and judge from Oregon Jennifer Lonergan, Canadian educator and nonprofit business executive John Lonergan (1839–1902), American Civil War army officer John Lonergan (artist), American visual artist Julia Lonergan, Australian judge Kate Lonergan, English actress Kenneth Lonergan, American playwright, screenwriter, and director Lenore Lonergan (1928–1987), actress Lloyd Lonergan (1870–1937), American scenario and screenwriter Mike Lonergan, American basketball player and coach Richard Lonergan (1900–1925), American underworld figure and labor racketeer Sam Lonergan, Australian football player and coach Tom Lonergan, Australian footballer Tom and Eileen Lonergan, Peace Corps volunteers who went missing in 1998, presumed dead Walter Lonergan (1885–1958), American baseball player