Mary Agnes may refer to:
Mary Agnes Bishop (1857–1934), American journalist and newspaper editor- and publisher Mary Agnes Briand (1870–1955), French Catholic nun and Marist missionary in Fiji Mary Agnes Canty (1879–1950), Australian-born New Zealand Roman Catholic nun, teacher, and nursing school matron Mary Agnes Donoghue (born 1943), American screenwriter and director Mary Agnes Hickson (1821–1899), Irish antiquarian and genealogist Mary Agnes Moroney (1928–2003), American woman who, as a child, was kidnapped Mary Agnes Snively (1847–1933), Canadian nurse Mary Agnes Tincker (1833–1907), American novelist Mary Agnes Wall (1919–1983), American golfer Mary Agnes Yerkes (1886–1989), American impressionist painter, photographer, and artisan