KS may refer to:
- Kampfschwimmer, a German postwar commando frogman force
- Kartagener syndrome, rare genetic disorder which causes a defect in the action of the cilia
- Kamehameha Schools, independent school
- Kansas (United States postal abbreviations)
- Kaposi's sarcoma, tumor caused by Human herpesvirus 8 (HHV8)
- Kaplan-Sheinwold, bidding system in the game of contract bridge
- Kashmiri language (ISO 639 alpha-2: ks), Dardic language spoken primarily in the valley of Kashmir
- Kate Spade, American fashion designer
- Keratan sulfate, any of several sulfated glycosaminoglycans
- Kernel streaming, method of processing streamed data
- Kearny System, a parts numbering scheme developed for a Western Electric factory in Kearny, New Jersey
- Kernowek Standard, an orthography for Revived Cornish
- Key Stage in the UK education system
- Kiasu, Hokkien (a Chinese spoken variant) word for 'extreme fear of losing' (怕输)
- Kill stealing, practice in online games of stealing the rewards for defeating an enemy from other players
- Kimbo Slice, Bahamian American mixed martial arts fighter
- King's Scholar, scholar of Eton College denoted by the letters "KS" after the name in school lists
- King's Serjeant, obsolete legal position in the United Kingdom
- Klaus Schulze, a German electronic music composer and musician
- Klinefelter's Syndrome, condition caused by a chromosome aneuploidy—affected males have an extra X sex chromosome
- Kolmogorov–Smirnov test, goodness-of-fit test used for underlying probability distributions
- Komandittselskap, Norwegian type of company
- Kosovo, a disputed territory in the Balkans
- Kristen Stewart, American actress
- PenAir (IATA code: KS), Peninsula Airways, American airline based in Anchorage, Alaska
- Katawa Shoujo, an English bishoujo-style visual novel by Four Leaf Studios
ks (in lowercase) may also refer to:
- Kilosecond (ks), 1000 seconds (16 minutes, 40 seconds)
kS refers to:
- kilosample (kS), 1000 samples of a digitized signal, often expressed as a sample rate per unit of time, e.g. kS/s (kilosample per ])
Ks can also refer to:
- Ks, strikeouts in baseball
- Ks (plural of K), legal shorthand for Contract