Lisa Michelle Merrithew (born May 30, 1972 in Saint John, New Brunswick) is a noted Canadian public relations consultant and was the former fiancee of Peter MacKay, deputy leader of the Conservative Party of Canada and former leader of the Progressive Conservative Party of Canada.
She is the youngest child of Bobbie McLean and Gerald Stairs Merrithew.
Merrithew obtained her Bachelor of Arts degree from King's College and a Bachelor of Public Relations Degree from Mount Saint Vincent University in Halifax, Nova Scotia.
Her father served as a cabinet minister in the province of New Brunswick and both he and MacKay's father, Elmer MacKay, were Progressive Conservative cabinet members in the government of Brian Mulroney.