Mączewo [mɔnˈt͡ʂɛvɔ] is a village in the administrative district of Gmina Strzegowo, within Mława County, Masovian Voivodeship, in east-central Poland. It lies approximately 5 kilometres (3 mi) south-west of Strzegowo, 29 km (18 mi) south of Mława, and 89 km (55 mi) north-west of Warsaw.