Miączyn ([ˈmjɔnt͡ʂɨn]) is a village in Zamość County, Lublin Voivodeship, in eastern Poland. It is the seat of the gmina (administrative district) called Gmina Miączyn. It lies approximately 18 kilometres (11 mi) east of Zamość and 87 km (54 mi) south-east of the regional capital Lublin.