Klaatu may refer to:
- Klaatu (The Day the Earth Stood Still), the humanoid alien protagonist in the 1951 science fiction film The Day the Earth Stood Still and its 2008 remake
- Klaatu barada nikto, an iconic phrase from the film
- Klaatu (Star Wars), a minor character from the original trilogy whose name was inspired by The Day the Earth Stood Still
- Klaatu (band), a Canadian progressive rock group formed in 1973
- Klaatu (comics), a Marvel Comics alien
- Klaatu (podcaster), a technology journalist and educator
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