KM
- .km
- Bosnia and Herzegovina convertible mark
- Caspian Sea Monster
- Comoros
- KM Group
- KM Junction, West Virginia
- KM Malta Airlines
- KM-mount
- Kabataang Makabayan
- Kaiserliche Marine
- Kamenz (district)
- Kaplan–Meier estimator
- Kelley–Morse set theory
- Kennis Music
- Kernel method
- Kerry Militia
- Kevin Matthews (wrestler)
- Khmer language
- Kia Motors
- Kilometre
- Km (hieroglyph)
- Kmart
- Knights of Malta
- Knowledge management
- Konica Minolta
- Koninklijke Marine
- Kosovo and Metohija
- Kosovska Mitrovica
- Kriegsmarine
- Kysucké Nové Mesto
- Messenia
- Michaelis–Menten kinetics
- Royal Yugoslav Navy
- Sovereign Military Order of Malta
- Standard Catalog of World Coins