Princess Maria Antónia of Braganza, Infanta of Portugal (Maria Antónia Micaela Rafaela Gabriela Adelaide Xavier Josefa Expedita Gregoria) (12 March 1903, Viareggio, Lucca, Toscana, Italy – 6 February 1973, Water Mill, Suffolk, New York) was a member of the House of Braganca. She married Sidney Ashley Chanler, the grandson of John Winthrop Chanler and Margaret Astor Ward.