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- Barbara of Daun (d.1547), Lady of Rixingen
- Barthe, Viscountess of Marsan
- Béatrice of Albon (1161–1228), Dauphine of Viennois, Countess of Albon, Grenoble, Oisans and Briancon, 1162-1228
- Beatrice I of Bigorre, Countess of Bigorre, 1055–1095
- Beatrice II of Bigorre, Viscountess of Fezensac & Countess of Bigorre, 1112–1114
- Beatrice III of Bigorre (1104–1156), Countess of Bigorre, 1128-?
- Beatrice IV of Bigorre, Viscountess of Marsanm 1185-?
- Beatrice of Bourbon (1320–83), Lady of Creil
- Beatrice I, Countess of Burgundy, Countess Palatine of Burgundy
- Beatrice II, Countess of Burgundy, Countess Palatine of Burgundy, 1205–1231
- Beatrice of Clermont (d.c1364), Countess of Charolais, 1316-1364
- Beatrice of Montfort (d.1311), Lady of Rochefort, Countess of Montfort-l'Aumary
- Beatrice of Portugal (d.1374), Lady of Alburquerque
- Beatrice of Provence (1234–1267), Lady of Forcalquier & Countess of Provence, 1245-1267
- Beatrice of Sabran (1182–1248), Countess of Gap and Embrun, Lady of Caylar
- Beatrice of Savoy, also known as la Grande Dauphine, Lady of Faucigny, 1268-? which she inherited from her mother, Agnes of Faucigny
- Beatrice of Savoy, Countess of Forcalquier and Gap, 1245-1256
- Beatrice of Thiers, also known as Beatrice of Thiern, (1174–1228) Countess of Chalon-sur-Saône, 1202-1227
- Beatrice Ferillo, Heiress of Muro Lucano
- Beatriu de Montcada Heiress of Moncada
- Beatrix of Burgundy, Countess of Vienne, 1224.
- Beatrix, Lady
- Beatrix of Burgundy (d.1216-?), Lady of Montreal
- Beatrix of Burgundy (1257–1310), Lady of Bourbon, Lady of Saint-Just, Countess of Charolais
- Beatrix of Évreux (1392–1407), Duchess of Nemours
- Beatrix of Maine, Countess of Maine
- Beatrix of Montfort (1245–1312), Countess of Montfort-L’Aumary, 1249-1312
- Beatrix of Putten (d.1354), Lady of Putten and Strijen
- Beatrix of the Netherlands, Queen of the Netherlands, 1980–Present
- Benedetta of Cagliari, Judge of Cagliari, 1214–1233
- Berenguela of Castile, Queen of Castile, 1217, Queen of Leon, 1217
- Berta of Aumale, Countess of Aumale, 1048–1052
- Bertha of Limburg, Heiress of Monschau, Montjoie
- Bertha of Rouergue, Countess of Rouergue, 953/954-1064
- Berthe of Cornouaille (1119–1157), Duchess of Brittany, 1148-1157
- Berthe of Tuscany, Countess of Arles, 936-?
- Blanche I of Navarre (1386–1441), Queen of Navarre
- Blanche II of Navarre (1424–1464), Queen of Navarre
- Blanca of Molina, Lady of Molina, 1248-1293?
- Blanche of Aumale, Countess of Aumale, 1343–1387
- Blanche of Dammartin, Lady of Nesle, Countess of Dammartin
- Blanche de Dreux (1270–1327), Lady of Brie-Comte-Robert
- Blanche of Lancaster (1345–1369), Duchess of Lancaster
- Blanche of Ponthieu (d.1387), Lady of Montgomery, Countess of Aumale, 1343–1387
- Bonne de la Roche, Joint Lady of Thebes, 1240
- Brianda de Beaumont (d.1588), Countess of Lerin
Read more about this topic: List Of Female Rulers And Title Holders