Oituz is a commune located in Bacău County within the Western Moldavia region of Romania. It serves as a rural administrative division composed of six distinct villages.
The constituent villages of the commune include Călcâi (Zöldlonka), Ferestrău-Oituz (Fűrészfalva), Hârja (Herzsa), Marginea, Oituz, and Poiana Sărată (Sósmező).