Gzin Dolny [ˈɡʑin ˈdɔlnɨ] is a village in the administrative district of Gmina Dąbrowa Chełmińska, within Bydgoszcz County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies 4 kilometres (2 mi) north of Dąbrowa Chełmińska, 23 km (14 mi) north-east of Bydgoszcz, and 30 km (19 mi) north-west of Toruń.