The Battle of Monte Castello was an engagement that took place from 25 November 1944 to 21 February 1945 during the Italian campaign of World War II. It was fought between the Allied forces advancing into northern Italy and the dug-in German defenders. The battle marked the Brazilian Expeditionary Force's entry into the land war in Europe. Starting in November 1944, fierce combat dragged on for three months, ending on 21 February 1945. Six Allied attacks were mounted against the German forces, four of which were tactical failures.

The Italian campaign of World War II, also called the Liberation of Italy following the German occupation in September 1943, consisted of Allied and Axis operations in and around Italy, from 1943 to 1945. The joint Allied Forces Headquarters (AFHQ) was operationally responsible for all Allied land forces in the Mediterranean theatre and it planned and led the invasion of Sicily in July 1943, followed in September by the invasion of the Italian mainland and the campaign in Italy until the surrender of the German Armed Forces in Italy in May 1945.