Full Frontal Feminism by Jessica Valenti
Feminism is for Everybody by Bell Hooks
Feminist Theory by Bell Hooks
(really anything by Bell Hooks)
The Handmaid’s Tale by Margaret Atwood (this one is fiction but SO worth the read)
The Feminine Mystique by Betty Friedan (has its flaws but is basically credited with jumpstarting the feminist movement altogether)
Our Bodies, Ourselves by the Boston Women’s Health Collective (this book has had many editions published since its first edition in the late 60s)
There are many more but those came to mind immediately. Great question!!!