| Official Name: | Mjåvatn |
| Settlement Type: | Village |
| Pushpin Map: | Agder#Norway |
| Pushpin Label Position: | top |
| Pushpin Map Caption: | Location of the village |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Southern Norway |
| Subdivision Name2: | Agder |
| Subdivision Type3: | District |
| Subdivision Name3: | Østre Agder |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Froland |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Postal Code Type: | Post Code |
| Postal Code: | 4828 Mjåvatn |
| Coordinates: | 58.5387°N 8.4897°W |
| Elevation M: | 120 |
| Elevation Footnotes: | [1] |
Mjåvatn is a village in Froland municipality in Agder county, Norway. The village is located along Norwegian County Road 42, about northwest of the village of Blakstad-Osedalen, about south of the village of Hinnebu, and about east of the village of Herefoss.