| Official Name: | Io |
| 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: | Nordhordland |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Alver |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Postal Code Type: | Post Code |
| Postal Code: | 5917 Rossland |
| Elevation M: | 17 |
| Elevation Footnotes: | [1] |
| Coordinates: | 60.5606°N 5.0211°W |
Io is a village in Alver municipality, in Vestland county, Norway. The village sits on the shore of the Herdlefjorden along the northern coast of the island of Holsnøy, about southwest of the village of Rossland.