Gonthier is a surname. Notable people with the surname include:
Brigitte Gonthier-Maurin (born 1956), member of the Senate of France representing the Hauts-de-Seine department Charles Gonthier, CC (1928–2009), Puisne judge on the Supreme Court of Canada Charles Gonthier, Prince of Schwarzburg-Sondershausen (1830–1909), ruler of the principality of Schwarzburg-Sondershausen within the German Empire Dominique-Ceslas Gonthier (1853–1917), Canadian Roman Catholic priest, Dominican, author, and professor François-Pierre-Gonthier Maine de Biran (1766–1824), French philosopher Johanne Gonthier (born 1954), Quebec politician Linard Gonthier (1565–after 1642), glass painter who worked in Troyes, France Roger Gonthier (1884–1978), French architect in Limoges
See also Gonthier Group SA, company that develops, markets, and provides Swiss annuities Reasons of the Supreme Court of Canada by Justice Gonthier