Looking into this, I see a lot of people have very different ideas of how a slasher works. In my mind, a slasher movie starts with a lot of people and people get killed off one by one. This would include stuff like Alien in my mind. I looked at other opinions and saw that the resounding answer was, "No." I'm not going to step on toes so this is my list of movies that are undeniably slashers.

I'm not being lazy by having multiple from the same franchise.