Łasin [ˈwaɕin] (German: Lessen) is a town in Grudziądz County, Kuyavian-Pomeranian Voivodeship, Poland, with 3,271 inhabitants (2004). It is the seat of the gmina (administrative district) called Gmina Łasin. It lies approximately 25 kilometres (16 mi) east of Grudziądz and 78 km (48 mi) north-east of Toruń.