Komsin [ˈkɔmɕin] is a village in the administrative district of Gmina Czerwińsk nad Wisłą, within Płońsk County, Masovian Voivodeship, in east-central Poland. It lies approximately 6 kilometres (4 mi) north-east of Czerwińsk nad Wisłą, 25 km (16 mi) south of Płońsk, and 50 km (31 mi) north-west of Warsaw.