Crna or CRNA or cRNA can have several meanings. In the languages of the former Yugoslavia, it means "black" when describing a feminine object. The Cyrillic form is црна. It could mean:
- Crna (river), a river in the Republic of Macedonia
- Certified Registered Nurse Anesthetist, a medical qualification in the United States
- Črna na Koroškem, a municipality in Slovenia
- cRNA (genetics), RNA derived from cDNA through standard RNA synthesis
- Crna Ruka, a secret pan-Serbian nationalist association
- Crna Gora, a name for Montenegro