| Lemonsjøen | |
| Pushpin Map: | Innlandet#Norway |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location of the lake |
| Coordinates: | 61.7775°N 9.07°W |
| Location: | Vågå Municipality, Innlandet |
| Basin Countries: | Norway |
| Area: | 3.6395km2 |
| Reference: | NVE[1] |
Lemonsjøen is a lake in Vågå Municipality in Innlandet county, Norway. It is located on the eastern edge of the Jotunheimen mountain range. The 3.6km2 lake lies about south of the village of Vågåmo. The larger lake Tesse lies about west of this lake and the lake Flatningen lies about to the northeast.