Lagacé or Lagace is a surname. Notable people with the surname include:
Anne Lagacé Dowson (born Toronto, Ontario), award-winning radio journalist Bernard Lagacé (1930–2025), Canadian organist and musicologist Gisèle Lagacé (born 1970), Canadian writer and illustrator Jacob Lagacé (born 1990), Canadian ice hockey player Jean-Guy Lagacé (born 1945), former professional ice hockey defenceman Maurice E. Lagacé (born 1931), judge currently serving on the Federal Court of Canada Maxime Lagacé (born 1993), Canadian ice hockey goaltender Patrick Lagacé (born 1972), French-Canadian journalist Pierre Lagacé (born 1957), former professional ice hockey centre
See also Raymond Lagacé Trophy, awarded annually to the Defensive Rookie of the Year in the Quebec Major Junior Hockey League Lagasse