Gmina Osiek[2][3] is an urban-rural gmina (administrative district) in Staszów County, Świętokrzyskie Voivodeship, in south-central Poland.

Its seat is the town of Osiek, which lies approximately 21 kilometres (13 mi) east of Staszów and 71 km (44 mi) south-east of the regional capital Kielce.

According to the 2011 Poland census, there were 7,904 people residing in Osiek Commune, of whom 50.9% were male and 49.1% were female (out of which the population in rural areas amounts to 5,903, of whom 51.2% were male and 48.8% were female).

[1] Apart from the town of Osiek, Gmina Osiek contains the villages and settlements of Bukowa, Długołęka, Kąty, Łęg, Lipnik, Matiaszów, Mikołajów, Mucharzew, Nakol, Niekrasów, Niekurza, Ossala, Ossala-Lesisko, Pliskowola, Strużki, Suchowola, Sworoń, Szwagrów, Trzcianka, Trzcianka-Kolonia and Tursko Wielkie.

Gmina Osiek is bordered by the gminas of Baranów Sandomierski, Gawłuszowice, Łoniów, Padew Narodowa, Połaniec, Rytwiany and Staszów.