Komasin [kɔˈmaɕin] is a village in the administrative district of Gmina Wapno, within Wągrowiec County, Greater Poland Voivodeship, in west-central Poland. It lies approximately 2 kilometres (1 mi) south of Wapno, 21 km (13 mi) north-east of Wągrowiec, and 66 km (41 mi) north-east of the regional capital Poznań.