Helga Frideborg "Frida" Maria Stéenhoff, née Wadström (11 December 1865, in Stockholm – 22 June 1945, in Stockholm), was a Swedish writer and women's rights activist. She was a leading participant of the public debate of gender equality and a contributor of several radical progressive publications. She was engaged in the women suffrage movement and several humanitarian organisations. During World War II, she participated in anti-fascist work. Frida Stéenhoff was a leading central figure of the free love movement in Sweden, for birth control, sex and romance without marriage, and critical toward the institution of marriage, subjects for which she became controversially known by her debut novel: Lejonets unge (Lion's Child) from 1896. She is credited with having introduced the modern concept