Tajenko [taˈjɛŋkɔ] is a village in the administrative district of Gmina Bargłów Kościelny, within Augustów County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 9 kilometres (6 mi) south-east of Bargłów Kościelny, 18 km (11 mi) south of Augustów, and 68 km (42 mi) north of the regional capital Białystok.