Henriette "Henni" Forchhammer, also known as Margarete Forchhammer was a Danish educator and women"s rights activist.
She was born in 1863 to Johannes Nicolai Georg Forchhammer, a sister of physicist and educator Johannes Georg Forchhammer and singer Viggo Forchhammer and aunt of theatre director Bjarne Forchhammer.
She was a granddaughter of Johan Georg Forchhammer and grandniece of August Friedrich Wilhelm Forchhammer. She chaired the organization from 1913 to 1931. She also co-founded the Women"s International League for Peace and Freedom in 1915, and was vice president of the International Council of Women from 1914 to 1930.
From 1920 to 1937 she was a delegate to the League of Nations.