Olszak [ˈɔlʂak] (German: Dreikathen)[1] is a settlement in the administrative district of Gmina Świeszyno, within Koszalin County, West Pomeranian Voivodeship, in north-western Poland.

[2] It lies approximately 3 kilometres (2 mi) south-east of Świeszyno, 9 km (6 mi) south of Koszalin, and 132 km (82 mi) north-east of the regional capital Szczecin.

The settlement has a population of 26.

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