| Șercaia | |
| Name Other: | Valea Poiana Mărului, Șinca |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Brașov County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Poiana Mărului, Șinca Nouă, Șinca Veche, Șercaia |
| Length: | 46km (29miles) |
| Mouth: | Olt |
| Mouth Location: | Hălmeag |
| Mouth Coordinates: | 45.8548°N 25.1384°W |
| Basin Size: | 350km2 |
The Șercaia is a left tributary of the river Olt in Romania. It discharges into the Olt in Hălmeag.[1] Its length is 46km (29miles) and its basin size is 350km2. The upper reach of the river, upstream of the confluence with the Holbav is also known as Valea Poiana Mărului. The middle reach of the river, from the junction with the Holbav to the confluence with the Scurta (downstream of the village of Vad) is known as the Șinca.
The following rivers are tributaries to the river Șercaia (from source to mouth):