| OIK | Odense Ishockey Klub 
| Others |
| OIK | Oh I Know
| Others |
| OIK | Ombudsperson Institution in Kosovo
| Others |
| OIK | Open It Kit
| Others |
| OIK | Operaen i Kristiansund
| Others |
| OIK | Oppenheim Immobilien-Kapitalanlagegesellschaft GmbH (German: Oppenheim Real Estate Investment Company; Oppenheim, Germany)
| Others |
| OIK | Option Installation Key
| Others |
| OIK | Organisation fur Internationale Kontakte
| Others |
| OIK | Ornamental Iron of Kalamazoo (Kalamazoo, Michigan)
| Others |
| OIK | Osobni Identifikacni Kod (Czech: Personal Identification Code)
| Others |