Cor de Groot (July 7, 1914 – May 26, 1993) was a Dutch pianist and composer.
He studied piano with Egbert Veen and Ulferts Schults, and composition and conducting under Sem Dresden.
After becoming a soloist with the Concertgebouw Orchestra, he won the fifth prize at the 1936 international contest for pianists in Vienna.
He played all over the world and recordings that exist demonstrate a strong sense of structure, a clean rhythmic attack and very precise dynamic shadings.
He arranged more than 80 pieces for the left hand; his Apparitions, voor piano (linkerhand alleen) (1961) were described by one reviewer as "intense and expressive piano music that should make it a joy for a pianist to develop his left hand.