Marysin [maˈrɨɕin] is a village in the administrative district of Gmina Rejowiec, within Chełm County, Lublin Voivodeship, in eastern Poland. It lies approximately 7 kilometres (4 mi) north-east of Rejowiec, 11 km (7 mi) south-west of Chełm, and 57 km (35 mi) east of the regional capital Lublin.