Anna of Brunswick-Grubenhagen-Einbeck (1414 – 4 April 1474) was a daughter of Duke Eric I of Brunswick-Grubenhagen and his wife, Elisabeth of Brunswick-Göttingen, daughter of Otto I, Duke of Brunswick-Göttingen.

Anna's first marriage was with Duke Albert III of Bavaria. They had the following children:

• John IV (1437–1463), Duke of Bavaria
• Ernest (1438–1460)
• Sigismund of Bavaria (1439–1501)
• Albert (1440–1445)
• Margaretha (1442–1479), married in 1463 with Marquess Frederick I of Mantua (1441–1484)
• Elisabeth (1443–1484), married in 1460 with Elector Ernest of Saxony (1441–1486)
• Albert IV (1447–1508)
• Christopher (1449–1493)
• Wolfgang (1451–1514)
• Barbara, a nun in Munich

After Albert's death, she married Duke Frederick III of Brunswick-Calenberg-Göttingen. This marriage remained childless.