Antonin [anˈtɔnin] is a village in the administrative district of Gmina Ciechanowiec, within Wysokie Mazowieckie County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 4 kilometres (2 mi) east of Ciechanowiec, 27 km (17 mi) south of Wysokie Mazowieckie, and 64 km (40 mi) south-west of the regional capital Białystok.