'Una Sava' was a German and Croat operation against the partisan forces of Josip Broz Tito in the puppet state of Croatia in Axis-occupied Yugoslavia (3/5 January 1943).

The undertaking’s objective was the destruction of an undetermined partisan concentration, believed to number around 800 persons, in the Una-Sava river bend in the area between Prijedor and Bosanska Novi.

The German contribution to the Axis force was elements of the 721^st Grenadierregiment and 661^st Artillerieregiment of Generalleutnant Josef Reichert’s 714^th Division, and that of the Croats the 1, 2 and 3/2^nd Mountain Brigade, 4/3^rd Mountain Brigade and the 12^th Ustase Battalion.

Other than its operations order, no record of this operation has been found, suggesting that the undertaking was perhaps cancelled.