Anna Cecilia Petra Östergren (born 29 September 1965 in Kiruna Municipality) is a Swedish feminist writer, debater, social commentator and an instructor in self-defense.
She also wrote a book about her mother, who was beaten to death by a man she had had a brief relationship with, entitled Att komma till ro med det allra värsta (Coming to terms with the worst).
Her involvement with teaching men self-defence made her a controversial figure with radical feminists, and the rift became complete when she published an article in Bang magazine in which she questioned whether all pornography was essentially misogynous.
From its origin, Östergren was one of the few people who publicly challenged the radical feminist position on prostitution which culminated in the sexköpslagen (Sex Purchase Act) 1999.
In addition to her books, Östergren writes regularly for newspapers and magazines, including Svenska Dagbladet, LO-tidningen, Expressen, Aftonbladet, Axess magasin and Voltaire and regularly gives public talks, and is consulted on prostitution and gender issues.