- Kojima Nobuo
- Kojima-Schur theorem
- Kojima Tetsuzo
- Kojin Kalatani
- Kojo Abraham
- Kojojash
- Kojo Laing
- Kokin wakashū
- kokkeibon (comical book)
- kokoshnik
- Koktokay Li-Be-Nb-Ta deposit
- Kokuryūkai
- Kola Peninsula
- kola processing
- Kolbe electrolytic synthesis
- Kolchin
- Kolkata
- kollag
- kollagraph
- Kollegg Rust Westinghouse furnace
- Kolmogorov
- Kolmogorov-Alexander product
- Kolmogorov-Arnold-Moser theorem
- Kolmogorov-Arnold-Moser theorem KAM theorem
- Kolmogorov-Arnold-Moser torus KAM torus