Stefania Sempołowska (1 October 1869 – 31 January 1944) was a Polish educator, activist and writer.

She has been described as the leader of the movement for prisoners' rights in Poland during most of her lifetime.^[1]

Sempołowska was born on 1 October 1869^[2] in the village of Polonisz, Poznań Voivodeship (now Greater Poland Voivodeship). At age 17 she passed the Teacher Patent at the Government Commission in Warsaw. Since then she was a teacher, supporter of education, kids' rights activist, journalist, and writer – she wrote many school books. Between the World Wars, she became a publicist who fought for equal educational opportunities. She was a member of the Democratic Education Society "Nowe Tory" ("New Tracks"), co-editor of the teen magazine Z bliska i z daleka ("From Near and Far"), and later the biweekly for kids and educators W słońcu ("In the Sun"). She died on 31 January 1944^[3] in Warsaw, and her funeral took place on 2 February.^[3]