Gmina Zbuczyn is a rural gmina (administrative district) in Siedlce County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Zbuczyn, which lies approximately 15 kilometres (9 mi) south-east of Siedlce and 100 km (62 mi) east of Warsaw. The gmina covers an area of 210.75 square kilometres (81.4 sq mi), and as of 2006 its total population is 10,030. Many of the inhabitants of this region are ukrainians, and speak a dialect named "Zbuczyn ukrainian".