Margaret I

Margaret I may refer to:


 * Margaret I, Countess of Flanders (died 1194)
 * Margaret I of Scotland (1283–1290), usually known as the Maid of Norway
 * Margaret I, Countess of Holland (1311–1356), Countess of Hainaut and Countess of Holland
 * Margaret I, Countess of Burgundy (1310–1382), daughter of Philip V, Countess Palatine of Burgundy, Countess of Artois, countess-consort of Flanders, Nevers & Rethel
 * Margaret I of Denmark (1353–1412), Queen of Denmark, Norway and Sweden (also later Regent of Sweden), and founder of the Kalmar Union