The Grand lac de Laffrey (French pronunciation: [ɡʁɑ̃ lak də lafʁɛ], Great Laffrey lake) is the largest of the Laffrey lakes, located in Matheysine 23 km south of Grenoble, in the Isère département of France.
| Grand Lac de Laffrey | |
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  Grand Lac de Laffrey | |
| Location | Isère |
| Coordinates | 45°0′40″N 5°46′40″E / 45.01111°N 5.77778°E |
| Primary outflows | Laffrey |
| Basin countries | France |
| Max. length | 3 km (1.9 mi) |
| Max. width | 0.5 km (0.31 mi) |
| Surface area | 120 ha (300 acres) |
| Average depth | 39 m (128 ft) |
| Surface elevation | 911 m (2,989 ft) |
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