| Coca | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Buzău County |
| Length: | 8km (05miles) |
| Mouth: | Slănic |
| Mouth Location: | Niculești |
| Mouth Coordinates: | 45.4389°N 26.7397°W |
| Mouth Elevation: | 284m (932feet) |
| Basin Size: | 16km2 |
The Coca is a right tributary of the river Slănic in Romania. It discharges into the Slănic in Niculești. Its length is 8km (05miles) and its basin size is 16km2.