Opera Nazionale Balilla (ONB) was an Italian Fascist youth organization functioning between 1926 and 1937, when it was absorbed into the Gioventù Italiana del Littorio (GIL), a youth section of the National Fascist Party.

The National Fascist Party was a political party in Italy, created by Benito Mussolini as the political expression of Italian fascism and as a reorganisation of the previous Italian Fasces of Combat. The party ruled the Kingdom of Italy from 1922 when Fascists took power with the March on Rome until the fall of the Fascist regime in 1943, when Mussolini was deposed by the Grand Council of Fascism. It was succeeded, in the territories under the control of the Italian Social Republic, by the Republican Fascist Party, ultimately dissolved at the end of World War II.