Jaczniki [jat͡ʂˈniki] is a village in the administrative district of Gmina Lipsk, within Augustów County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 8 kilometres (5 mi) east of Lipsk, 40 km (25 mi) east of Augustów, and 71 km (44 mi) north of the regional capital Białystok.