Arnold Scaasi (born May 8, 1931) is an acclaimed fashion designer who has created gowns for First Ladies Mamie Eisenhower, Jacqueline Kennedy, Barbara Bush, Hillary Clinton, and Laura Bush, in addition to such notable personalities as Joan Crawford, Ivana Trump, Princess Yasmin Aga Khan, Lauren Bacall, Diahann Carroll, Elizabeth Taylor, Catherine Deneuve, Brooke Astor, and Mary Tyler Moore.

Scaasi was born Arnold Isaacs in Montreal, Quebec, Canada, the son of a furrier. His decision to pursue a career in fashion was made at the age of fourteen during a trip to Australia to visit his stylish aunt. He returned to Montreal to study at the Cotnoir-Capponi School of Design and completed his education at the Chambre Syndicale de la Haute Couture Parisienne in Paris. He apprenticed at the House of Paquin before moving to New York City to work with designer Charles James.