Gać (Polish pronunciation: [ɡat͡ɕ]) is a village in the administrative district of Gmina Łomża, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 15 kilometres (9 mi) south-east of Łomża and 63 km (39 mi) west of the regional capital city of Białystok.

In 2002 the village had a population of 986.