Koziminy-Stachowo [kɔʑiˈminɨ staˈxɔvɔ] is a village in the administrative district of Gmina Płońsk, within Płońsk County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north-east of Płońsk and 63 km (39 mi) north-west of Warsaw.