Your list of cult classic Sci Fi Movies

[Goober]

Here is mine.The list of sci fi movies that started it all 

1) War of the Worlds 

2) 2001 a space odyssey 

3) Alien

let’s hear yours 

[Kenny B]

Men in Black

Independence Day

The Matrix

The Fifth Element

Back to the Future

[Headhammer]

It seems like most of your selections are pretty mainstream movies that did well at the box office. I kinda view cult classics as movies that didn't do well originally, but later found an audience that gave them cult status. Of course Rocky Horror is the epitome of a cult classic. My list of cult sci-fi movies would be:

Escape From New York

Blade Runner

Dark City

Repo Man

[WaffleHouseTour]

Primer - off the beaten path independent time travel movie - its a mind bender, definitely worth the watch

 

[Goober]

Never saw primer.

great list of movies so far.Would be a perfect binge fest watching those 

[Goober]

Would add Thx 1138, Soylent green, and omega man. 
 

but would have to say 2001 space odyssey and Aliens set the tone for many a sci fi movie. And the radio version of the war of the worlds 

[Bulldog]

The Day the Earth Stood Still (original 1951 version)

2001: A Space Odyssey 

Back to the Future 

Terminator 2: Judgement Day 

Edge of Tomorrow 

The Martian

Galaxy Quest 

 

[Coachbutt]

Buckaroo Bonzi. Great cast

[WaffleHouseTour]

Silent Running

Logans Run

 

But seriously people -- if you can find Primer you won't regret it. 

[ParFore74x]

Aside from those already listed, I would add in the Mad Max movies, specifically the original trilogy. 
Mad Max

The Road Warrior

Mad Max Beyond Thunderdome

[Andrian11]

Hi everyone! My favorite are Men in Black, The Matrix, Blade Runner, Dark City, Back to the Future. These are the cult films of my childhood. I was glued to the screen every time they started. It didn't matter how many times I saw each of them. But now I'm an adult and prefer to watch a little different content. You could say adult content (xxx videos).

Edited March 20 by Andrian11
added some details