| Official Name: | Isdalstø |
| Other Name: | Isdalsstø |
| Settlement Type: | Village |
| Pushpin Map: | Vestland#Norway |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location of Isdalstø |
| 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: | 5916 Isdalstø |
| Elevation M: | 7 |
| Elevation Footnotes: | [1] |
| Coordinates: | 60.5553°N 5.2692°W |
Isdalstø or Isdalsstø is a village in Alver Municipality in Vestland county, Norway.
The village lies along the southern end of the Radfjorden between the villages of Alversund and Knarvik. It was a central hub for ferry traffic until the 1970s.