Ms. 45, also known as Angel of Vengeance, is a 1981 American exploitation thriller film directed by Abel Ferrara and starring Zoë Tamerlis Lund.

Inspired by films such as 1973's Thriller – A Cruel Picture and 1974's Death Wish, the film is a rape and revenge story about Thana, a mute woman who becomes a misandristic spree killer (not strictly a vigilante) after she is raped twice in one day when going home from work. It was critically maligned on its theatrical release, but is now generally highly regarded among fans of underground[1] and independent film.[2]

It was acquired by Alamo Drafthouse Films in October 2013 and remastered in HD from the original negatives. The distributor released the film on Blu-ray, DVD, and digital copy in March 2014.[3]