Casals (, ) is a Catalan surname, the plural form of Casal (house). Notable persons with that surname include: Marta Casals Istomin (born 1936), wife of Pablo Casals and former president of Manhattan School of Music Pablo Casals (1876-1973), cellist and conductor Rosemary Casals (born 1948), American professional tennis player Toni Casals Rueda (born 1980), Andorran ski mountaineer "Sammy Casals", a police detective in the film Heat portrayed by Wes Studi See also Casal (disambiguation) Catalan-language surnames