Zajęczniki [zajɛnt͡ʂˈɲikʲi] is a village in the administrative district of Gmina Drohiczyn, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland.

The village lies approximately 7 kilometres (4 mi) east of Drohiczyn, 9 km (6 mi) west of Siemiatycze, and 85 km (53 mi) south of the regional capital Białystok.

In 1921, the village had 54 houses and 412 inhabitants, including 210 Orthodox and 202 Catholics.

In 1975–1998, the town administratively belonged to the Białystok Voivodeship.

This Siemiatycze County location article is a stub.