| Caşin River | |
| River | |
| Countries | Romania |
|---|---|
| Counties | Harghita County, Covasna County |
| Tributaries | |
| - left | Repatu Mare, Borvizu, Cetatea |
| - right | Carpenul, Râul Primejdios, Bella, Valea Seacă, Petriceni, Turia |
| Villages | Plăieşii de Sus, Plăieşii de Jos, Sânzieni, Târgu Secuiesc, Catalina |
| Mouth | Râul Negru |
The Caşin River is a tributary of the Râul Negru in Romania.