Gęsin [ˈɡɛ̃ɕin] is a village in the administrative district of Gmina Zakrzewo, within Aleksandrów County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 4 kilometres (2 mi) east of Zakrzewo, 12 km (7 mi) south of Aleksandrów Kujawski, and 30 km (19 mi) south of Toruń.