3K
- 3000 (disambiguation)
- 3000 (number)
- 3000 metres
- 3K (comics)
- 3K Battery
- 3Kingdoms
- Cosmic microwave background radiation
- Dirty, Dangerous and Demeaning
- EIF3K
- Grumman F6F Hellcat
- IATA
- Jetstar Asia
- K3 (disambiguation)
- KKK (disambiguation)
- Kinder, Küche, Kirche
- Ku Klux Klan
- List of common resolutions
- Mystery Science Theater 3000
- Phosphoinositide 3-kinase
- Python (programming language)
- Radio Television of Serbia
- Three Kingdoms (disambiguation)
- Toyota K engine
- Washington State Route 128