M
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- Mabille of Bellem (d.1082), Lady of Belleme, 1070–1082; Countess of Alençon
- Madeleine Charlotte of Piney-Luxembourg, Countess of Ligny & Duchess of Piney-Luxemburg, 1680–1701
- Mafalda Manrique of Lara, also known as Mafalda Gonzalez, Lady of Molina, 1239-1248
- Magdalena of Neuenahr, Heiress of Limburg
- Magdalena Christina of Sayn, Countess Sayn-Hachenburg, 1661–1715
- Mahaut of Artois (1268–1329), Countess of Artois, 1302-1329
- Mahaut I of Courtenay (1185–1257), Countess of Nevers, 1192–1257
- Mahaut of Courtenay (c1254-1303), Countess of Chieti
- Mahaut II of Dampierre (1234–1262), Lady of Broigny, Donzy, Montjoy, Perche-Goet, Saint Aignan & Torigny, 1254–1262, Lady of Bourbon, 1257–1262, Countess of Auxerre, Nevers & Tonnerre, 1257–1262
- Mahaut of Dammartin, Countess of Aumale, 1216–1259
- Mahaut of Grignon (d.1192), Countess of Grignon and Tonnerre
- Margaret de Newburg, Countess of Warwick (d.1253)
- Margaret of Salisbury (1473–1521), 8th Countess of Salisbury, also known as Margaret Plantagenet, Blessed Margaret Pole
- Margaret, Countess of Blois (d.1230)
- Margaret, Countess of Carrick (d.1292), also known as Marjorie of Carrick
- Margaret Maultasch, Countess of Tyrol
- Margaret of Austria, Duchess of Savoy (1480–1530), Countess of Charolais, 1493–1530, Countess Palatine of Burgundy, 1493–1530, Countess of Artois, 1493–1530
- Margaret of Béarn (1245–1319), Countess of Bigorre
- Margaret of Dampierre, Countess of Rethel, 1384–1402
- Margaret of Enghien (1365–1397), Countess of Conversano
- Margaret I, Countess of Burgundy, Lady of Salins, 1361–1382, Countess Palatine of Burgundy, 1361–1382, Countess of Artois, 1361–1382
- Margaret I of Flanders, Countess of Flanders & Hainaut, 1244–1280
- Margaret of Freiburg (d.1300/39), Heiress of Badenweiler
- Margaret I of Holland (1311–1356),
- Margaret II of Flanders, Countess of Hainaut, Holland & Zeeland, 1345–1349
- Margaret III, Countess of Flanders
- Margaret of Limburg (d.1479), Heiress of Bedburg & Hakenbroich
- Margaret of Lorraine-Adamant (d.1477), Lady of Arschot
- Margaret, Countess of Mar, Countess of Mar, 1374–1391
- Margaret of Norfolk (1320–99), Duchess of Norfolk, 1397–99, 2nd Countess of Norfolk, 1338-99.
- Margaret of Reyghersvliet, Countess of Harnes, ?-1340
- Margaret of Salisbury, also known as Margaret Longespee, Countess of Salisbury
- Margaret of Zeeland, Countess of Zeeland, 1345–1354
- Margaret Wake, 3rd Baroness Wake (1300–1349), Baroness Wake of Liddell, 1349
- Margareta of Gleichen (1480–1567), Countess of Gleichen in Blankenhain
- Margarethe of Courtenay, Margravine of Namur
- Margarethe of Marck (1527–99), Countess of Arenberg
- Margarethe of Ravensberg (d.1389), Heiress of Ravensberg and Berg
- Margery of Warwick (d.1253), Countess of Warwick
- Margherita di Chiaramonte, sister and heiress of Ugone, Count of Chiaramonte, Lord of Castronovo, Noja, Torremare and Sevisio
- Margherita di Sangineto (d. after 1380), Countess of Altomonte and Corigliano
- Marguerite de Neuilly, Lady of Passava; Heiress of Akova
- Margrethe II of Denmark (b. 1940), Queen of Denmark, 1972–Present
- Marguerite de Navarre, Duchess of Berry, 1517–1549, Duchess of Alençon & Countess of Perche, 1525-1549?
- Marguerite of Alençon (1503-?), Countess of Alençon
- Marguerite of Amboise (d.1475), Princess of Talmond, Viscountess of Thouars, Lady of Mauleon, Lady of Montrichard
- Marguerite of Angoulême, Duchess of Alençon & Berry, Countess of Rodez, Armagnac, Perche, Fezensac, L’Isle-Jourdain, Porhoet, Pardiac, Viscountess of Lomagne, Fezenzaguet, Brulhois, Cressey, Auvillars, Baroness of Castelnau, Caussade, Montmiral, Lady of La Fleche and Bauge
- Marguerite of Anjou and Maine (1273–99), Countess of Anjou and Maine, 1290-99
- Marguerite of Armagnac (d.1504), Duchess of Nemours and Countess of Guise & Pardiac, 1503-1504
- Marguerite of Bauge (d.c1252), Lady of Miribel
- Marguerite of Béarn (1245–1319), Viscountess of Béarn, 1290–1301
- Marguerite of Beaumont (d.1307), Countess of Charmerlan
- Marguerite of Berrie, Lady of Berrie
- Marguerite of Bigorre, Countess of Bigorre, 1290–1301
- Marguerite of Blois (1170–1230), Lady of Romorantin & Millancay & Countess of Dunois & Blois, 1218-1230
- Marguerite of Blois (d.1419), Countess of Sancerre, Lady of Charenton
- Marguerite of Brittany (1392-1428), Lady of Guillac
- Margaret of Burgundy, Queen of Sicily (1250–1308), Countess of Tonnerre, 1262-1308
- Marguerite of Comminges (1363–1443), Countess of Comminges, 1375-1375
- Marguerite of Dampierre (d.1316), Lady of Dampierre and Saint-Dizier
- Marguerite of Enghien (1365–1397), Countess of Brienne, 1394–1397
- Marguerite of Joigny, Countess of Joigny, Lady of Pouilly and Premartin
- Marguerite of Joinville (1354–1418), Lady of Joinville & Countess of Vaudemont, 1365-1415
- Marguerite of Lorraine (1463–1521), Lady of Mayenne, 1499–1509
- Marguerite of Macon (d.1257/59), Lady of Salins, 1219-1225
- Marguerite of Melun (d.1448), Countess of Tancarville, 1415-1448
- Marguerite of Nesle (1300–1350), Lady of Argies & Chimay & Countess of Soissons, 1306-1350
- Marguerite of Orléans (1406–1466), Countess of Vertus
- Marguerite de Rohan (1616/17-84), Duchess of Rohan and Frontenay, Princess of Leon and Soubise, Countess of Porhoet
- Marguerite of Soissons (d.1350), Lady of Chimay and Countess of Soissons, 1307-1315
- Marguerite Grenier, Lady of Caesarea, 1239–1264
- Marguerite of Lusignan, Lady of Tyre, 1284–1286
- Marguerite of Montmorency (1175-?), Lady of Verneuil, Poissy, Vernouillet and Meulan.
- Marguerite of Nesle (1300–1350), Lady of Catheu, 1334–1350
- Marguerite of Valois, Countess of Auvergne, 1608–1610, Duchess of Étampes, 1582-1598.
- Marguerite Charlotte of Piney-Luxembourg, Countess of Ligny & Duchess of Piney-Luxemburg, 1616–80
- Maria de Urgell (d.1196), Señora de Almenara
- Maria dalle Carceri (d.1323), Heiress of 1/6 of Euboea as the daughter of Gaetano dalle Carceri; Marquise (1/2) of Bodonitsa, 1311–1358, as the widow of Albert Pallavicini. She shared Bodonitsa with their daughter, Guglielma.
- Maria of Antioch-Armenia, Lady of Toron, 1229–1266
- Maria of Cleves (1553-?), Duchess of Cleves
- Maria of Hornes (d.1434), Countess of Hornes, Lady of Duffel and Waelheim
- Mary, Queen of Hungary(1371–95), Queen of Croatia, 1382–1395, Queen of Hungary, 1382–1395
- Maria of Jever, Lady of Jever, 1511–1575
- Maria of Molina, Lady of Molina, 1293?-1322?
- Maria of Montferrat, Queen of Jerusalem, 1205
- Maria I of Portugal (1734–1816), Queen of Portugal, 1777-1816.
- Maria of Randerath (d.1395), Lady of Randerath
- Maria of Vianden (c1337-1400), Countess of Vianden
- Maria Albina of Hauteville (d. after 1205), Countess of Lecce
- Maria Angelina Ducena Palaeologina, Ruler of Epirus, 1385-1386
- Maria Beatrice Ricciarda (1650–1729), Sovereign Duchess of Massa, Sovereign Princess of Carrara, 1790–1797, 1814–1829, 7th Duchess of Ajello, Baroness of Paduli and Lady of Lago, Laghitello, Serra e Terrati, Princess of Modena and Reggio
- Maria del Pilar Garcia Sancho y Zabala, Duchess of Najera, 1864
- Maria Eleonora I Boncompagni (1686–1745), also known as Maria Eleoonora I Boncompagni-Ludovisi, Marchioness of Populonia, Countess of Conza, Princess of Piombino, 1707-1745
- Maria Lopez of Haro, Lady of Vizcaya, 1311–1325, 1326-1333
- Maria Luisa de Aragon y Pernstein (d.1663), 6th Duchess of Luna, 7th Duchess of Villahermosa.
- Maria Manuela of Portugal (1538–87), Duchess of Viseu.
- Maria Pacheco (c1400-?), Lady of Belmonte.
- Maria Teresa Francesca Cybo Malaspina (1725-1790), Sovereign Duchess of Massa, Sovereign Princess of Carrara, 6th Duchess of Ajello, Baroness of Paduli, Sovereign Lady of Moneta and Avenza, Lady of Lago, Laghitello, Serra and Terrati
- Maria Theresa of Austria (1717–1780), Queen of Croatia, 1743–1780, Queen of Hungary, 1740-1780.
- Maria da Varona, Princess of Euboea, 1317-1337
- Maria dalle Carceri, Princess of Euboea, 1279-1296
- Maria II Zaccaria, Princes of Achaea, 1402-1404
- Marie de Béarn (d.1186), Heiress of Béarn, 1170
- Marie de Sully, Lady of Sully, Lady of Craon, Countess of Guînes, Sovereign Princess of Boisbelle
- Marie of Albret (1491–1549), Lady of Orval & Countess of Rethel, 1500–1540
- Marie of Alençon (d.1549), Countess of Alençon
- Marie of Artois (d.1365), Lady of Merode
- Marie of Aumale, Countess of Aumale, 1239–1251
- Marie of Avesnes (d.1280), Lady of Avesnes, Countess of Blois, 1241-1280
- Marie of Baux (d.1417), Princess of Orange, 1393-1417
- Marie of Belleme (1199–1250), Lady of Ponthieu
- Marie of Berry (1367–1434), Countess of Montpensier, 1416–1434, Duchess of Auvergne, 1400–1434
- Marie of Berry (d.1425), Countess of Montpensier
- Marie of Bois-Belle, Princess of Bois Belle
- Marie of Boulogne, Countess of Mortain, 1167–1173
- Marie of Bourbon, also known as Marie of Bourbon-Vendôme, (1539–1601), Countess of Gace, Hambye and Briquebec, Countess of Saint-Pol, 1546–1601, Duchess of Estouteville
- Marie of Bourbon (1315–1387), Princess of Achaea and Morea, 1364-1370 (Abd)
- Marie de Bourbon-Conde (1606–1692), Countess of Soissons, 1612–1692
- Marie de Bourbon-Montpensier (1605–1627), Countess of Mortain & Duchess of Châtellerault, Montpensier & Saint-Fergau, 1608–1627
- Marie of Brittany, Lady of La Guerche (1391–1446), Lady of La Guerche
- Marie of Châtillon (1343–1404), Lady of Guise and Mayenne, 1360-1404
- Marie of Châtillon, Vidamese of Laon
- Marie of Coucy (1366–1405) Countess of Soissons, 1398-1405
- Marie of Enghien (d.1318), Lady of Zotteghem, Burgravine of Ghent
- Marie of Enghien, Lady of Argos and Nauplia, 1376-88
- Marie II of Enghien (1367–1446), also known as Mary of Enghien, Lady of Castro & Countess of Lecce & Brienne, 1384-1446.
- Marie of Flanders (d.1350), Viscountess of Chateaudun
- Marie of Ham, Lady of Ham
- Marie, Countess of Harcourt (1398–1476), Lady of Arschot, Brionne, Elbeuf, Forcalquier, L‘Islebonne, & La Saussaye & Countess of Aumale, Harcourt & Mortain, 1452-1476
- Marie-Adélaïde, Grand Duchess of Luxembourg (1894–1924), was reigning Grand Duchess of Luxembourg from 1912 to 1919
- Marie of Limoges (1260–1291), Viscountess of Limoges, 1263-1291
- Marie of Looz (d.1408), Lady of Château-Thierry, 1372-1408
- Marie of Lorraine (1615–1688), 8th Duchess of Guise, Duchess of Joyeuse & Princess of Joinville, 1675–1688
- Marie of Lusignan, Countess d'Eu, Countess of Eu, 1250-1260
- Marie of Luxemburg (1472–1547), also known as Marie de Luxemburg, Viscountess of Meaux & Countess of Ligny, Marle & Soissons, 1482–1547, 24th or 25th Countess of Saint-Pol, 1482–1547
- Marie of Luxemburg (1562–1623), Duchess of Étampes & Penthièvre, 1569-1623
- Marie of Montmirail (d.1272), Heiress of Montmirail, Oisy, Crèvecœur, Conde-en-Brie, the Viscounty of Meaux & Chatelainie of Cambrai, Lady of Conde-Brie
- Marie of Orléans-Longueville (1625–1707), also known as Marie de Longueville, Duchess of Estouteville, Sovereign Princess of Neuchâtel & Countess of Valangin, 1699-1707
- Marie of Ponthieu (1186–1251), Countess of Montreuil & Pontannhieu, 1221-1251
- Marie of Rethel, Countess of Rethel, 1243–1245
- Marie II Zaccharia, Princess of Achaea, 1402-1404.
- Marie of Vilademuls, Lady of Vilademuls
- Marie Anne de Bourbon, Duchess of Étampes, 1712-1718.
- Marie Jeanne Baptiste of Savoy, Duchess of Aumale, 1659-1686
- Marie Liesse of Luxemburg-Saint-Pol (1611–1660), Princess of Tingry
- Marie Sophie Colbert (d.1747), Margravine of Seignelay & Countess of Tancarville
- Marquesa of Ampurias (1322–27), Countess of Ampurias
- Marquise of Cabrera, Viscountess of Cabrera
- Mary I of England, Queen of England, 1553-1558
- Mary II of England, Queen of England, 1689-1694
- Mary, Queen of Scots, 1542-1567
- Mary, Countess of Blois (1200–1241), also known as Marie of Avesnes, Lady of Romorantin and Millancay & Countess of Dunois & Blois, 1230-1241 and Lady of Chateaurenault and Countess of Chartres, 1236-1241
- Mary of Béarn, (1145–1186), Viscountess of Bruilhois & Béarn, 1170-1173
- Mary of Burgundy, also known as Mary the Rich, (1457–1482), Countess of Charolais & Zeeland, Countess Palatine of Burgundy, Duchess of Burgundy & Limburg, 1477–1482
- Maria of Sicily, Duchess of Athens, 1377–1388, Queen of Sicily, 1377–1388
- Mary Scott, 3rd Countess of Buccleuch, Countess of Buccleuch, 1651–1661
- Mascarose I of Armagnac, Countess of Armagnac & Fezensac, 1245-1249
- Mascarose II of Lomagne, Countess of Armagnac, 1249–1256, Viscountess of Fezensac, 1249–1256
- Mathe I of Albret (d.1283), Lady of Albret & Viscountess of Maremne, 1281–1283
- Mathe of Bigorre (1225–1270), Viscountess of Marsan, 1255-1270
- Mathilde of Amboise (d.1256), Lady of Amboise, 1218-1256
- Mathilde of Artois (d.1329), Countess of Artois, 1302-1329
- Mathilde of Baden (d.1259), Lady of Stuttgart
- Mathilde of Bethune (1220–1264), Lady of Bethune, Dendermonde/Termonde, Richebourg and Warneton
- Mathilde II of Boulogne (1202–1262), Countess of Boulogne, 1216–1262, Countess of Mortain, 1233–1235, Countess of Dammartin
- Mathilde of Burgundy (d.1005), Countess of Nevers
- Mathilde of Burgundy, Countess of Grignon
- Mathilde of Chalon, Lady of Donzy <--Daughter of Lambert of Chalon, Count of Chalon-sur-Saône; married Geoffrot I of Semur (950-1015)-->
- Mathilde of Chateau-du-Loir (d.1099), heiress of Chateau-du-Loir
- Mathilde of Châtillon, also known as Mahaut of Châtillon, Countess of Saint Pol, 1369–1372
- Mathilde of Hainaut, Princess of Achaea, 1313–1318
- Mathilde of Heinsberg (d.1189), Heiress of County Palatine of Sommerschenburg
- Mathilde of Landsberg (d.1255), Regent Margravine of Brandenburg, 1220-1225 for her son John I of Brandenburg (1208–1266)
- Mathilde of Rethel, Countess of Rethel, 1124-1151
- Mathilde of Saarbrücken, Countess of Saarbrücken, 1271–1274
- Matilda of Canossa (1046–1115), Lady of Canossa, Duchess of Tuscany, Countess of Reggio Emilia, Duchess of Spoletto, Margravine of Camerino.
- Matilda of Dammartin (1202–1258), Countess of Dammartin, Countess of Boulogne
- Matilda of Grignon (d.1192), Lady of Grignon
- Matilda of Hainaut, Princess of Achaea, 1313–1318
- Maud of Lancaster (1339–1362), Countess of Leicester
- Mayor of Castile, Countess of Ribagorza
- Mechtild of Brunswick-Lunenburg (1230–98), Regent Countess of Anhalt-Aschersleben, 1266–1270, for her sons Otto I and Heinrich III of Anhalt-Aschersleben.
- Mechtild of Guelders, Duchess of Guelders, 1371–1384
- Mechtild of Reifferscheid (d.1437), Heiress of Lordship of Bedburg
- Melisende of Arsuf, Lady of Arsuf, ?-1236
- Melisende of Chateaudun, Viscountess of Chateaudun
- Melisende of Jerusalem, Queen of Jerusalem, 1131–1153
- Melissende of Maine(d.890), heiress of Mayenne
- Mencia de Mendoza y Enriquez de Cabrera (d.1619), Duchess of Huescar
- Meullent I of Castile, Countess of Aumale, 1279–1324
- Miroslawa of Pomerelia (d.1233), Regent Duchess of Pomerania-Wolgast, 1220–1233, for her son Barnim I of Pomerania-Wolgast (1219–1264)
- Munia Mayor of Castile (Munia Elvira)) (990-1066), 5th Countess of Castile
Read more about this topic: List Of Female Rulers And Title Holders