Constantine Mavrocordatos (Greek: Κωνσταντίνος Μαυροκορδάτος, Romanian: Constantin Mavrocordat; February 27, 1711 – November 23, 1769) was a Greek noble who served as Prince of Wallachia and Prince of Moldavia at several intervals between 1730 and 1769. As a ruler he issued reforms in the laws of each of the two Danubian Principalities, ensuring a more adequate taxation and a series of measures amounting to the emancipation of serfs and a more humane treatment of slaves.