Osowiec

Osowiec may refer to:
 * Osowiec, Łódź Voivodeship (central Poland)
 * Osowiec, Lubusz Voivodeship (west Poland)
 * Osowiec, Masovian Voivodeship (east-central Poland)
 * Osowiec, Łomża County in Podlaskie Voivodeship (north-east Poland)
 * Osowiec, Mońki County in Podlaskie Voivodeship (north-east Poland)
 * Osowiec, Zambrów County in Podlaskie Voivodeship (north-east Poland)
 * Osowiec, Pomeranian Voivodeship (north Poland)
 * Osowiec, Warmian-Masurian Voivodeship (north Poland)
 * Osowiec, Słupca County in Greater Poland Voivodeship (west-central Poland)
 * Osowiec, Złotów County in Greater Poland Voivodeship (west-central Poland)
 * Osówiec, Greater Poland Voivodeship, Greater Poland Voivodeship (west-central Poland)
 * Osowiec Fortress, Russian fortress built in the 19th century in modern-day Osowiec-Twierdza, defended during World War I, today in Poland