'Berta' was an Axis unrealised operation against the partisan forces of Josip Broz Tito in the German puppet state of Croatia in German-occupied Yugoslavia (6/8 January 1943).

The undertaking’s objective was the destruction of the 1^st 'Krajinski' Assault Brigade of the 5^th Assault Division in the triangle bounded by Prijedor, Bronzani Majdan and Sanski Most in western Bosnia.

The German contribution included parts of the 721^st Grenadierregiment, 741^st Grenadierregiment and 661^st Artillerieabteilung of Generalleutnant Josef Reichert’s 714^th Division, and the Volksdeutschbataillon 'Ludwig von Baden', while that of the Croats included the 1^st and 2^nd Battalions of the 2^nd Mountain Brigade and the 4^th Battalion of Pukovnik Franjo Gjoić's 3^rd Mountain Brigade.

Planned as successor to the fighting two days earlier in the vicinity of Sanski Most, this operation was evidently cancelled, possibly as a result of heavy falls of snow or probably as it lay in the direct path of the much larger 'Weiss' (ii) scheduled to begin two weeks later.