| Gahččanjávri | |
| Caption Map: | Interactive map of the lake |
| Coordinates: | 69.5931°N 23.1308°W |
| Location: | Finnmark |
| Basin Countries: | Norway |
| Area: | 4.71km2 |
| Reference: | NVE |
Gahččanjávri is a lake in Guovdageainnu Municipality in Finnmark county, Norway. The 4.72km2 lake lies on the Finnmarksvidda plateau, about northwest of the village of Masi.[1]