| Tjörneshreppur | |
| Settlement Type: | Municipality |
| Mapsize: | 250px |
| Pushpin Map: | Iceland |
| Coordinates: | 66.1589°N -17.1261°W |
| Subdivision Type: | Country |
| Subdivision Name: | Iceland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Northeastern Region |
| Subdivision Type2: | Constituency |
| Subdivision Name2: | Northeast Constituency |
| Unit Pref: | Metric |
| Area Total Km2: | 199 |
| Population Total: | 55 |
| Population Density Km2: | 0.46 |
| Code1 Name: | Municipal number |
| Code1 Info: | 6611 |
Tjörneshreppur (pronounced as /is/) is a municipality in Iceland, part of the Norðurland eystra region. It is surrounded by the Norðurþing municipality on land, but has significant coastline.