Olcnava
Olcnava 
    Detrefalva  | |
|---|---|
Location of Olcnava in the Košice Region Location of Olcnava in Slovakia  | |
| Coordinates: 48°56′N 20°45′E / 48.93°N 20.75°E | |
| Country | Slovakia | 
| Region | Košice Region | 
| District | Spišská Nová Ves District | 
| First mentioned | 1312 | 
| Area | |
 • Total  | 15.21 km2 (5.87 sq mi) | 
| Elevation | 411 m (1,348 ft) | 
| Population  (2021)  | |
 • Total  | 1,022 | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 536 1  | 
| Area code | +421 53 | 
| Car plate | SN | 
| Website | olcnava | 
Olcnava (Hungarian: Detrefalva) is a village and municipality in the Spišská Nová Ves District in the Košice Region of central-eastern Slovakia.