Gérin-Lajoie is a French-Canadian surname. Notable people with this name include:
Antoine Gérin-Lajoie (1824–1882), Canadian (Quebec) poet and novelist Charles Gérin-Lajoie (1824–1895), Canadian (Quebec) businessman and political figure Marie Lacoste Gérin-Lajoie (1867–1945), Canadian (Quebec) feminist Paul Gérin-Lajoie (1920–2018), Canadian (Quebec) lawyer, philanthropist and politician
See also Gérin Gérin-Lajoie family Lajoie (disambiguation)