I looooooove Sci-Fi. 75% of the ficiton I read is Sci-Fi.
In no particular order
Fifth Element
2001 Space Odyssey
Alien
Predator ( people, this has to be one of the least heralded great Sci-Fi movie ever )
The Wrath of Khan (Star Trek)
Arrival
Contact
Blade Runner
ET
Close Encounters
T2. This movie
is good and Hahnol fits the character to a T.. He didn't have to act, just be his wooden, no expression Keanu-Reevesque self
Ok! I know this is a Science based forum but I allowed myself some subjectivity, so 11 movies became under this perception only, 10