|Location||Blaine County, Idaho|
|Primary inflows||Creek from Alice Lake|
|Primary outflows||Creek to Alturas Lake Creek to Salmon River|
|Basin countries||United States|
|Max. length||1.40 mi (2.25 km)|
|Max. width||0.55 mi (0.89 km)|
|Surface elevation||6,996 ft (2,132 m)|
Pettit Lake is a large alpine lake in Blaine County, Idaho, United States, located in the Sawtooth Valley in the Sawtooth National Recreation Area. The lake is approximately 16 miles (26 km) south of Stanley and 33 miles (53 km) northwest of Ketchum.
In the southern section of the Sawtooth Valley, Pettit Lake is the third largest lake in Sawtooth National Recreation Area. Just east of the Sawtooth Wilderness, Pettit Lake is at an elevation of 6,996 feet (2,132 m), downstream of popular destinations such as Alice Lake and the Twin Lakes.
- Sawtooth National Forest. “Sawtooth National Forest” [map].1:126,720, 1”=2 miles. Twin Falls, Idaho: Sawtooth National Forest, United States Forest Service, 1998.
- List of lakes of the Sawtooth Mountains (Idaho)
- Sawtooth National Forest
- Sawtooth National Recreation Area
- Sawtooth Range (Idaho)