| Ojdula | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Covasna County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Ojdula |
| Length: | 19km (12miles) |
| Mouth: | Râul Negru |
| Mouth Coordinates: | 45.983°N 26.1801°W |
| Basin Size: | 48km2 |
| Tributaries Right: | Orbaiul Mic |
The Ojdula (also: Orbai) is a left tributary of the Râul Negru in Romania. It flows into the Râul Negru near the city Târgu Secuiesc.[1] Its length is 19km (12miles) and its basin size 48km2.