OIK
| Acronym | Definition |
|---|---|
| OIK | Osobni Identifikacni Kod (Czech: Personal Identification Code) |
| OIK | Odense Ishockey Klub (Danish: Odense Ice Hockey Club; Odense, Denmark) |
| OIK | Ombudsperson Institution in Kosovo (est. 2000) |
| OIK | Option Installation Key |
| OIK | Ornamental Iron of Kalamazoo (Kalamazoo, Michigan) |
| OIK | Oppenheim Immobilien-Kapitalanlagegesellschaft GmbH (German: Oppenheim Real Estate Investment Company; Oppenheim, Germany) |