Martha Mechthild Ingeborg Seynsche (21 October 1905 in Barmen – 27 June 1994 in Göttingen) was a German mathematician.

Her father Johannes Seynsche (1857–1925) was a professor and senior teacher at the Unterbarmer Higher Girls' School.

She then studied in Marburg and Göttingen, and in 1929 passed the state examination for teachers in pure and applied mathematics and physics.

She also solved the queen problem for arbitrary n.[1][2] She married physicist Friedrich Hund (1896–1997) in Barmen on 17 March 1931.

Ingeborg Seynsche's final resting place is in the Munich Waldfriedhof, where her husband and sister Gertrud and her son-in-law Dieter Pfirsch are also buried.