Krojczyn (Polish: [ˈkrɔjt͡ʂɨn]) is a village in the administrative district of Gmina Dobrzyń nad Wisłą, within Lipno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland. It lies approximately 10 kilometres (6 mi) north-west of Dobrzyń nad Wisłą, 19 km (12 mi) south of Lipno, and 56 km (35 mi) south-east of Toruń.

In 2002 the village had a population of 453.