Cave of Evil in The Empire Strikes Back
The wampa attack is also a strong contender but that scene is at least meant to be a bit of a jump scare. When Luke Skywalker goes into a cave on Dagobah, you know something is going to be in there and you know the one thing it can’t be is Darth Vader. But then it is Vader. And Luke isn’t ready. And we’re worried he’s going to lose. Until he doesn’t. It’s a short but powerful bit of tension in the middle of the dynamic adventure. (Star Wars has some great scary scenes overall. Check out this list.)
