| Official Name: | Østby |
| Settlement Type: | Village |
| Pushpin Map: | Trøndelag#Norway |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location of the village |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Central Norway |
| Subdivision Name2: | Trøndelag |
| Subdivision Type3: | District |
| Subdivision Name3: | Neadalen |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Tydal |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Postal Code Type: | Post Code |
| Postal Code: | 7590 Tydal |
| Coordinates: | 63.0508°N 11.673°W |
| Elevation M: | 481 |
| Elevation Footnotes: | [1] |
Østby is a village in the municipality of Tydal in Trøndelag county, Norway. The village is located along the Nea River, about northeast of the municipal center of Ås.