Tuzkol () is a salt lake in Mendykara District, Kostanay Region, Kazakhstan.
The lake lies roughly ENE of Borovskoy, the district capital, northeast of Sosna and north of Aksuat.
Tuzkol lies in the Turgay Depression, to the south of the KazakhstanâÂÂRussia border. Larger Alakol lake is located to the south of the southern shore and Teniz to the NNW. River Ubagan flows northwards to the east of Tuzkol's eastern shore. The lake freezes in the winter.
The A21 Highway skirts the lake on its southern part.