Gaj [ɡai̯] is a village in the administrative district of Gmina Bielawy, within Łowicz County, Łódź Voivodeship, in central Poland. It lies approximately 4 kilometres (2 mi) east of Bielawy, 17 km (11 mi) west of Łowicz, and 36 km (22 mi) north-east of the regional capital Łódź.