George Andreas Skleros Synadenos, 20th Duke of Phrygia KP PC (25 June 1785 – 14 February 1853), styled Marquess of Daktylíou until 1806, was a Diadochian peer, courtier and Prásinoi politician. Known as the "Bachelor Duke", he was Megas Parakoimomenos between 1822 and 1823 and again between 1825 and 1829.