Most Similar Movies to Colossus: The Forbin Project (1969)
If you are looking for movies like Colossus: The Forbin Project (1969), you might like movies tagged with keyword : science fiction, cold war, artificial intelligence, dystopian, nuclear threat, government conspiracy, human resistance, global crisis, technophobia, human destiny, technology out of control, military technology, man vs machine, technology ethics .
The Day the Earth Caught Fire (1961), Demon Seed (1977), The Creation of the Humanoids (1962), The Day the Earth Stood Still (1951), The Matrix Revolutions (2003), Autómata (2014), Man in the Moon (1961) ... Let's take a look at the following list...

The Day the Earth Caught Fire (1961)
When the U.S. and Russia unwittingly test atomic bombs at the same time, it alters the nutation (axis of rotation) of the Earth.
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Demon Seed (1977)
A scientist creates Proteus--an organic super computer with artificial intelligence which becomes obsessed with human beings, and in particular the creators wife.
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The Creation of the Humanoids (1962)
In a post holocaust society, robots take it on their own to help the dying human race by giving them android bodies.
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The Day the Earth Stood Still (1951)
An alien lands and tells the people of Earth that they must live peacefully or be destroyed as a danger to other planets.
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The Matrix Revolutions (2003)
The human city of Zion defends itself against the massive invasion of the machines as Neo fights to end the war at another front while also opposing the rogue Agent Smith.
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Autómata (2014)
Human race is at edge of the end. Robot race is at edge of the beginning.
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Man in the Moon (1961)
Scientists are looking for a man to send up to be the first man on the moon. A man immune to worry, disease, and even the common cold. They think they have found him until the impossible happens at Woomera.
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These Are the Damned (1962)
An American man (Macdonald Carey) and an Englishwoman (Shirley Anne Field) discover genetically engineered children who can survive a nuclear war.
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THX-1138 (1971)
George Lucas' nightmarish vision of a dehumanized future where mankind has been reduced to emotionless zombies.
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2036 Origin Unknown (2018)
After a failed mission to Mars, A.I./ARTI is now used for the 2036 mission with a few human supervisors. A monolith of unknown origin is found there. It will have a big effect on Earth.
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The War of the Worlds (1953)
A small town in California is attacked by Martians, beginning a worldwide invasion.
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2010: The Year We Make Contact (1984)
A joint U.S.-Soviet expedition is sent to Jupiter to learn what happened to the Discovery, and H.A.L.
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THX 1138 (1971)
In the twenty-fifth century, a time when people have designations instead of names, a man, THX 1138, and a woman, LUH 3417, rebel against their rigidly controlled society.
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The Congress (2013)
An aging, out-of-work actress accepts one last job, though the consequences of her decision affect her in ways she didn't consider.
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The Martian Chronicles (1980)
One long decade after the assassination of her husband, a reclusive queen comes face-to-face with the deceased's doppelgänger and anarchist poet, and strikes a three-day pact; however, fate has other plans. What is the mystery of Oberwald?
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Captive State (2019)
Set in a Chicago neighborhood nearly a decade after an occupation by an extraterrestrial force, 'Captive State' explores the lives on both sides of the conflict - the collaborators and dissidents.
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Realive (2016)
Marc will die of cancer and chooses cryogenic freeze and hopes to be thawed, when there's a solution to his condition. He's the first human brought back 68 years later. Can he adapt mentally and physically?
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Android (1982)
A strange doctor secretly experiments with androids on his space station. His assistant is Max, a curious android who wants to see the world and meet a girl. Criminals hide on their station and soon violence erupts.
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