Princess Anna of Ysenburg und Büdingen[citation needed] (10 February 1886, Büdingen – 8 February 1980, Detmold) was the youngest child of Bruno, Prince of Ysenburg and Büdingen and his second wife, Countess Bertha of Castell-Rüdenhausen.

Through her second marriage to Leopold IV, Prince of Lippe, Anna was the titular Princess consort of Lippe.

Anna married firstly to Count Ernst of Lippe-Weissenfeld (1870-1914), sixth child and youngest son of Count Franz of Lippe-Weissenfeld (1820-1880) and his wife, Baroness Marie of Beschwitz (1836-1921), daughter of Baron Ferdinand of Beschwitz, on 21 November 1911 at Schloss Büdingen in Büdingen.

Anna and Ernst had one daughter before Ernst was killed at Gołdap on the Eastern Front during World War I on 11 September 1914: Anna married secondly to Leopold IV, Prince of Lippe, second eldest child of Count Ernst of Lippe-Biesterfeld and his wife, Countess Karoline of Wartensleben, on 26 April 1922 in Büdingen.

Anna and Leopold had one son: