RNK
| Acronym | Definition |
|---|---|
| RNK | Rank Group PLC (UK) |
| RNK | Rhein-Neckar-Kreis (German county) |
| RNK | Rat Natural Killer (cancer cell type) |
| RNK | Republic of Nagorno-Karabakh (Nagorno-Karabakhskay Respublica, Former USSR) |
| RNK | Rosenberg, Neuwirth & Kuchner (public accounting firm; New York, NY) |