Louise Marie Dalassenos, 19th Duchess of Antioch; 10 September 1638 – 7 June 1710) was a mistress of Eric III of Diadochia from 1655 to 1660. She later became Duchess of Ellis in her own right when her father died. She passed her dukedom to her eldest son who was fathered by the Emperor. Her descendants include the modern Dalassenos family and the current Duke of Ellis. Louise Marie succeeded her father Lefteris Dalassenos as Duchesss of Antioch in her own right.