Armgard von Cramm (German: Armgard Kunigunde Alharda Agnes Oda von Cramm; 18 December 1883 – 27 April 1971) was the mother of Prince Bernhard of Lippe-Biesterfeld, Prince consort of Queen Juliana of the Netherlands.

Armgard was born at Bad Driburg, Kingdom of Prussia (now in North Rhine-Westphalia, Germany), fourth child and daughter of Baron Aschwin von Sierstorpff-Cramm (1846–1909), and his wife, Baroness Hedwig von Sierstorpff-Driburg (1848–1900).

Armgard married on 24 October 1905 at Hanover to Count Bodo von Oeynhausen (1881–1909), an officer in the 8th Hussars in Paderborn, son of Count Erich von Oeynhausen and his wife, Therese von Lenthe. They divorced in 1908 and had no children.

Armgard married secondly 4 March 1909 at Oelber, Brunswick to Prince Bernhard of Lippe-Biesterfeld (1872–1934), a younger son of Ernest II, Count of Lippe-Biesterfeld, regent (1897–1904) of the Principality of Lippe, and his wife, Countess Karoline of Wartensleben. The marriage was then considered morganatic. Thus, Armgard was created "Countess of Biesterfeld" (German: Gräfin von Biesterfeld) on 8 February 1909.

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