| Acronym | Definition |
|---|
| ARK | Arkansas (old style) |
| ARK | Arkadelphia (Amtrak station code; Arkadelphia, AR) |
| ARK | Animal Refuge Kansai (Japan) |
| ARK | Absolute Return for Kids (UK) |
| ARK | Advances in Robot Kinematics (conference) |
| ARK | anti Root Kit |
| ARK | Archiving Tool for Kde |
| ARK | Admin Report Kit |
| ARK | anti Roll Kit |
| ARK | Arusha, Tanzania (airport code) |
| ARK | Acts of Random Kindness |
| ARK | Association to Rescue Kritters (St. Helen, MI) |
| ARK | Advisors of Rubi-Ka (Anarchy Online game volunteers) |
| ARK | Archival Resource Key |
| ARK | All-Purpose Readiness Kit (food storage) |
| ARK | Alt.Religion.Kibology (newsgroup) |
| ARK | Animal Rehabilitation Keep (University of Texas Marine Science Institute) |
| ARK | Artificial Reefs of the Keys |
| ARK | Athletes Running for Kids (est. 1989) |
| ARK | Astrophysics Research Knowledgebase |
| ARK | Archaeological Recording Kit |
| ARK | Apostolic Response At Kellenberg |
| ARK | Application, Results, Knowledge |
| ARK | Assets, Resources and Knowledge (facilities management) |