Diane Legault (born July 21, 1956) is a Quebec dentist and politician.
She was the member of the National Assembly for Chambly in Quebec. She represented the Liberal Party of Quebec and resigned on November 15, 2006. On November 7, 2006, she was elected President of the Ordre des dentistes du Québec, the professional order representing all the dentists in Quebec, for a five-year term. She was the first woman to hold this position.
Born in Montreal, Quebec, she received a Doctor in Dentistry from Université de Montréal in 1979 and a M.B.A. from Université de Sherbrooke in 1995. She was Director of Professional Services for the Ordre des dentistes from 1996 to 1998 and Executive Director and Secretary from 1998 to 2003.