Catharina Pietersdr Hooft (28 December 1618 – 30 September 1691) was a woman of the Dutch Golden Age. She became famous at a very early age, when she was painted by Frans Hals.
At the age of sixteen she married Cornelis de Graeff, nineteen years her senior and the most powerful regent and mayor of Amsterdam. Thus she became the first lady of Soestdijk, one of the family's country houses. Catharina Hooft was also a Lady of the High and free Fief of Purmerland and Ilpendam.