Gaj [ɡai̯] is a village in the administrative district of Gmina Witkowo, within Gniezno County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 8 kilometres (5 mi) north of Witkowo, 16 km (10 mi) east of Gniezno, and 63 km (39 mi) east of the regional capital Poznań.