Maria Guyomar de Pinha, also Maria Guiomar de Pina, Dona Maria del Pifia, Marie Guimar or Madame Constance in French or Thao Thong Kip Ma (Thai: ท้าวทองกีบม้า) (Born in Ayutthaya in 1664), was a Siamese woman of the 17th century who lived in Ayutthaya, Siam (modern Thailand). She was the wife of the Greek adventurer Constantine Phaulkon.