| AK | Alaska (US postal abbreviation) | |
| AK | Acknowledge | |
| AK | Animal Kingdom (Disney World theme park) | |
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| AK | Auckland, New Zealand | |
| AK | Alicia Keys (singer) | |
| AK | Arbeitskreis (German: Working Party) | |
| AK | Acknowledgment | |
| AK | Ass Kisser | |
| AK | Actinic Keratosis | |
| AK | Asahi Kasei (manufacturer; various locations) | |
| AK | Applied Kinesiology | |
| AK | Above Knee (amputation) | |
| AK | Any Key | |
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| AK | Andrei Kirilenko (basketball player) | |
| AK | Atomic Kitten (band) | |
| AK | Armia Krajowa (Home Army, the Polish Resistance, WWII) | |
| AK | Arbeiterkammer (Austrian trade union) | |
| AK | Commercial Cargo Ship (US DoD ship designation) | |
| AK | Aga Khan (title of leader of a sect within the Ismaili branch of Islam) | |
| AK | Aamir Khan (Indian actor) | |
| AK | Ass Kicking | |
| AK | Adenylate Kinase | |
| AK | Anthony Kiedis (member of Red Hot Chili Peppers) | |
| AK | Astigmatic Keratotomy (eye surgery) | |
| AK | Alles Klar (German: All Right, Okay) | |
| AK | Avtomat Kalashnikova (Soviet assault rifle) | |
| AK | Azad Kashmir | |
| AK | Ash Ketchum (Pokémon) | |
| AK | Application Kit | |
| AK | All Knowing | |
| AK | Allgemeine Kredit (German: General Credit) | |
| AK | Avada Kedavra (Harry Potter) | |
| AK | Awesome Kids | |
| AK | Andrew Kim | |
| AK | Audio Karate (band) | |
| AK | Authorization Key | |
| AK | Alternate Key (database theory) | |
| AK | Aviation Storekeeper | |
| AK | Armeekorps (German Army corps) | |
| AK | AutomatKarbin (Swedish assault rifle) | |
| AK | Adaptation Kit | |
| AK | Data Acknowledgment (ANSI) | |
| AK | Advanced Kaizen (methodology) | |
| AK | Alte Kaker (Yiddish: Old Timer) | |
| AK | Anime Kingdom | |
| AK | Aurora Knights (gaming clan) | |
| AK | Knight of the Order of Australia (Obsolete) | |
| AK | Automatic Keying | |
| AK | Atari Karts (Atari Jaguar video game) | |
| AK | Abu Khader Group (Amman, Jordan) | |
| AK | Ascension Kit (NetHack) | |
| AK | Ante Calendas (Latin: Before the Calends, epigraphy) | |
| AK | Anatomic Kinesiology | |
| AK | (USN Rating) Aviation Storekeeper | |
| AK | Automatic/Assault Rifle/Carbine/Cannon (Swedish military) | |