Tin Cup Lake is an alpine lake in Custer County, Idaho, United States, located in the White Cloud Mountains in the Sawtooth National Recreation Area.

No trails lead to the lake, but it can be accessed from Sawtooth National Forest trail 680.

[1] Tin Cup Lake is just southeast of the Chinese Wall, northeast of Calkins Peak, and in the same basin as Dike, Quartzite, and Gunsight Lakes.

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