Bagatele is a village in the administrative district of Gmina Wąsewo, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland. It lies approximately 15 km west of Ostrów Mazowiecka and 85 km north-east of Warsaw. On 8 September 1939, during the German invasion of Poland at the start of World War II, German troops perpetrated a massacre of 11 Poles in Bagatele (see also Nazi crimes against the Polish nation). The victims were three local farmers and eight refugees from other locations.