Anna Maria of Ostfriesland (23 June 1601 – 15 February 1634) was a German noblewoman.

[1] [2] She was a daughter of Count Enno III of East Frisia and Anna of Holstein-Gottorp.

Her paternal grandmother was Katharina of Sweden, a daughter of Gustav I of Sweden and his second wife Margareta Leijonhufvud.

On 4 September 1622 she married her first cousin Adolf Frederick I, Duke of Mecklenburg-Schwerin (1588–1658).

They had the following children: This article about a German duchess is a stub.