Ka
Ka or KA may refer to:

Arts and entertainment
K.A. (Kohntarkosz Anteria), a 2004 album by Magma
Kà, a Cirque du Soleil show
Ka (Dark Tower), a plot element in Stephen King's Dark Tower series
Mister Mosquito, a 2001 video game, known in Japan as Ka

Businesses and organizations
Kappa Alpha Order, a fraternity founded in 1865 at Washington and Lee
Kappa Alpha Society, a fraternity founded in 1825 at Union College
Karenni Army, a Burmese guerilla organization
Knattspyrnufélag Akureyrar, an Icelandic football club
Kuklos Adelphon, an 1800s-era Southern fraternity
Khan Academy, a non-profit educational organization
King's Arms, Oxford, a pub known as the KA

Language
Languages
Ka, a variety of the Central Banda language
Georgian language, by ISO 639-1 code

Characters
Ka (Cyrillic), a letter in Russian and other eastern european languages
Ka (Indic), a group of related glyphs from the Brahmic family of scripts
Devanagari ka, a letter in the Devanagari script
Ka (Javanese) (ꦏ), a letter in the Javanese script
Ka (kana), a syllabic grapheme in the Japanese katakana and hiragana scripts

People
Ka (pharaoh) (fl. c. thirty-second century B.C.), Predynastic pharaoh of Upper Egypt
Ka (rapper) (born 1972), performer

Places
Ka Farm, Østre Toten, Norway; see List of short place names
Ka Island (Ka-to), North Korea
KA postcode area, Scotland
Ka River, Nigeria
Karlsruhe, Germany (e.g. code used on German vehicle registration plates)
Karnataka, India

Science and technology
Ka, an acid dissociation constant
Ka band, a microwave band
Ka, the absorption rate constant of a drug
Ka, number of non-synonymous substitutions at a DNA site, used in Ka/Ks ratio
Ka tree, Terminalia carolinensis
ka, thousand years, kyr
Keepalive, a computer network message
Kiloampere (kA), a unit of electric current
kiloannus or kiloannum (ka), a unit of time equal to one thousand (103) years

Transport
Ford Ka, a car
NZR KA class, a New Zealand steam locomotive
Cathay Dragon (IATA code KA), formerly Dragonair
Kenya Airways
Code for products of Kamov, a Russian rotorcraft manufacturing company

Other uses
Ka (Bengali), a consonant character
Ka (cuneiform)
Ka or kꜣ, "double" or "vital essence", an Ancient Egyptian concept of the soul or spirit
Knight or Dame of St Andrew, a Barbadian award
Kingda Ka, a roller coaster at Six Flags Great Adventure
KA, a carbonated drink produced by the company A.G. Barr
KA, law enforcement jargon for "known associate"