Świętajno (Polish: [ɕfjɛnˈtajnɔ]; German: Schwentainen) is a village in Szczytno County, Warmian-Masurian Voivodeship, in northeastern Poland. It is the seat of the gmina (administrative district) called Gmina Świętajno.

It lies approximately 16 kilometres (10 mi) east of Szczytno and 54 km (34 mi) south-east of the regional capital Olsztyn.

The village has a population of 2,000.