| Official Name: | Bydel Østbyen |
| Settlement Type: | Borough |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Central Norway |
| Subdivision Name2: | Trøndelag |
| Subdivision Type3: | District |
| Subdivision Name3: | Trondheim Region |
| Subdivision Type4: | City |
| Subdivision Name4: | Trondheim |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Population Density Km2: | auto |
| Postal Code Type: | Post Code |
| Postal Code: | 7041 Trondheim |
| Coordinates: | 63.4167°N 37°W |
Østbyen is a borough of the city of Trondheim in Trøndelag county, Norway. The borough was established on 1 January 2005 in a municipal borough reform that reduced the number of boroughs in the city. The borough of Lerkendal lies to the southwest, Midtbyen lies to the northwest, and the municipality of Malvik lies to the east. Trondheimsfjorden lies to the north. The borough consists of the areas of Møllenberg, Nedre Elvehavn, Rosenborg, Lade, Strindheim, Brundalen, Charlottenlund, Jakobsli, Ranheim and Vikåsen.[1] It has 39,171 residents.