| Râiosul | |
| Name Other: | Ileana |
| Pushpin Map: | Romania |
| Subdivision Type1: | Country |
| Subdivision Name1: | Romania |
| Subdivision Type2: | Counties |
| Subdivision Name2: | Giurgiu County |
| Subdivision Type3: | Villages |
| Subdivision Name3: | Naipu |
| Length: | 12km (07miles) |
| Mouth: | Câlniștea |
| Mouth Location: | Naipu |
| Mouth Coordinates: | 44.1058°N 25.7622°W |
| Mouth Elevation: | 60m (200feet) |
| Basin Size: | 50km2 |
The Râiosul or Ileana is a left tributary of the river Câlniștea in Romania. It flows into the Câlniștea in Naipu. Its length is 12km (07miles) and its basin size is 50km2.