Reddit reviews The Dread of Difference: Gender and the Horror Film (Texas Film and Media Studies)

Horror is actually a great subject to dip into a little feminist theory. You've got Men, Women, & Chainsaws, The Dread of Difference, and The Monstrous Feminine as film studies texts. If you're already interested in horror, they're all worth a read and it's better to get a little academic/theoretical rather than letting reddit/the internet/etc. inform your understanding of feminism.

Some of the best horror fiction was written by women - Frankenstein, The Haunting of Hill House, Interview with the Vampire, Rebecca, etc.

You could argue whether a lot of movies are "feminist" because they have female protagonists, discuss gender, critique patriarchy, etc. but it's all open to debate. Like you can read Rosemary's Baby or Carrie or others as feminist films or not. As Gorgobutt said, a female protagonist does not necessarily make a movie "feminist" and conversely you can make the case that movies with female antagonists are feminist for showing women are people with an equal potential for evil as men (Antichrist, Eyes Of My Mother, etc.).

I'd throw Jennifer's Body, A Girl Walks Home Alone At Night, Season of the Witch, May, Ginger Snaps, The Company of Wolves, and The Descent on the pile.

Men, Women & Chainsaws, The Dread of Difference, Projected Fears are all really interesting reads!