Nielisz [ˈɲɛliʂ] is a village in Zamość County, Lublin Voivodeship, in eastern Poland. It is the seat of the gmina (administrative district) called Gmina Nielisz. It lies approximately 18 kilometres (11 mi) north-west of Zamość and 60 km (37 mi) south-east of the regional capital Lublin.