Dagenais is a surname. Notable people with the surname include:
Camille Dagenais (1920–2016), Canadian engineer Kati Dagenais (born 1969), Canadian musher Melissa Dagenais (born 2000), Canadian soccer player Pierre Dagenais (born 1978), Canadian ice hockey player Sarah Dagenais-Hakim, Canadian actress and singer Todd Dagenais (born 1970), American college volleyball coach, former player and author
See also Dagenais v Canadian Broadcasting Corp