Thyra Margrethe Marie Kirstine Jensen (1865âÂÂ1949) was a Danish writer and women's rights activist.
In addition to her children's stories, which often drew on her own childhood, she wrote for adults, producing a number of short biographies. She was active in Southern Jutland's Women Association, supporting the Danish-speaking minority in Schleswig. Her most successful book was probably Constance Leth. Grundtvigs Ungdomskærlighed (Constance Leth. Grundtvig's Young Romance (1922), republished in an enlarged edition in 1941 as Fruen pÃÂ¥ Egeløkke.
From 1935, Jensen chaired South Schleswig's Women's Association (Den Sydslesvigske Kvindeforening), introducing the Slesvigske Kvinders Julebog (Schleswig Women's Christmas Book) which she published from 1936.