Z3 may refer to:
- Z3 (computer), a computer created by Konrad Zuse
- AEG Z.3, a German aircraft built before World War I
- BMW Z3, a BMW sports car model
- Motorola Rizr Z3, a slide mobile phone
- BlackBerry Z3, a smartphone
- Samsung Z3, a smartphone
- Sony Xperia Z3, a smartphone
- Zenon: Z3, a television series
- Z3 file extension, a story file for the Infocom Z-machine
- Z3 Theorem Prover, an SMT Solver by Microsoft
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