| Official Name: | Onarheim |
| Settlement Type: | Village |
| Pushpin Map: | Vestland#Norway |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location of the village |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Western Norway |
| Subdivision Name2: | Vestland |
| Subdivision Type3: | District |
| Subdivision Name3: | Sunnhordland |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Tysnes |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Postal Code Type: | Post Code |
| Postal Code: | 5694 Onarheim |
| Elevation M: | 73 |
| Elevation Footnotes: | [1] |
| Coordinates: | 59.9517°N 5.6253°W |
Onarheim is a village in Tysnes municipality in Vestland county, Norway. The village is located on the southeastern shores of the island of Tysnesøya, along the Hardangerfjorden. The village has been home to a church since the 12th century. The present Onarheim Church was built in 1893, and it serves the southeastern part of the municipality.[2] There is also a small school in Onarheim.