| Goagiu | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Harghita County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Inlăceni, Firtănuș, Medișoru Mic, Goagiu, Avrămești, Cechești, Cristuru Secuiesc |
| Length: | 23km (14miles) |
| Mouth: | Târnava Mare |
| Mouth Location: | Cristuru Secuiesc |
| Mouth Coordinates: | 46.28°N 25.0262°W |
| Basin Size: | 92km2 |
| Tributaries Right: | Valea Stânei |
The Goagiu is a right tributary of the river Târnava Mare in Romania. It discharges into the Târnava Mare in Cristuru Secuiesc.[1] Its length is 23km (14miles) and its basin size is 92km2.