Sonnier is a surname. Notable people with the surname include:
Dallas Sonnier (born 1980), American film producer, publisher, and entrepreneur Elmo Patrick Sonnier (1950–1984), American murderer and rapist Floyd Sonnier (1933–2002), American Cajun artist J. Bert Sonnier (born 1938), American thoroughbred trainer Jo-El Sonnier (born 1946), American singer-songwriter and accordionist Keith Sonnier (1941–2020), American sculptor, performance artist, video and light artist