Trękus [ˈtrɛnkus] is a village in the administrative district of Gmina Purda, within Olsztyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 8 kilometres (5 mi) west of Purda and 10 km (6 mi) south-east of the regional capital Olsztyn. It is located within the historic region of Warmia.

Before 1772 the area was part of Kingdom of Poland, from 1772 of Prussia, after 1871 of Germany (East Prussia), and after 1945 of Poland.

Three historic wayside shrines, typical for Warmia, are located within the village.