Ilsa, the Wicked Warden (originally released as Greta: Haus Ohne Männer, and also known as Greta, the Mad Butcher, Ilsa: Absolute Power, and Wanda, the Wicked Warden) is a 1977 Canadian sexploitation film directed by Jess Franco, written by Ric Meyers, and starring Dyanne Thorne. The plot follows Greta, a warden at a psychiatric hospital for young women, and a girl who feigns illness in order to investigate the disappearance of her sister, a former patient.

Often considered the third installment in the Ilsa film series, The Wicked Warden was not initially produced with the intent of being as such, despite Thorne's starring role. The film contains scenes of graphic violence, which Meyers commented was "sicker" than its predecessor in its depictions. Meyers further opined that it had been shot at the same time as Franco's Barbed Wire Dolls due to the shared cast and film setting.