| Pârâul Primejdios | |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Harghita County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Cașinu Nou |
| Length: | 14km (09miles) |
| Mouth: | Caşin |
| Mouth Coordinates: | 46.1852°N 26.0817°W |
| Basin Size: | 80km2 |
| Progression: | Cașin→ |
| Tributaries Left: | Drumul Carului, Pârâul Despletit |
The Pârâul Primejdios is a right tributary of the river Cașin in Romania. The Cașin itself is a tributary of the river Râul Negru.
The Pârâul Primejdios flows into the Cașin near Iacobeni. Its length is 14km (09miles) and its basin size is 80km2.