Casa del Balilla, Italian national heritage building in Legnano, Italy.

Casa del Balilla is a building with rationalist architecture in Legnano that offered spacious areas and facilities for sports and leisure activities. The structure displays typical features of this style with exposed brick, polished serizzo stone, and large windows across two floors.

Built in 1933 to designs by municipal engineer Giuseppe Moro with architect Giorgio Laneve, the Casa del Balilla was inaugurated in December 1933 by Renato Ricci, president of the Opera Nazionale Balilla. It was named after Arnaldo Mussolini (1885–1931), Benito Mussolini's younger brother. From 1937 to 1943 it housed the Gioventù Italiana del Littorio, the fascist youth organization into which the Opera Nazionale Balilla was merged.

The building served as a gathering place where young people and athletes trained and spent time together. The spaces reflect the era's focus on physical fitness and community activities.

The sources give no street address for the building, so orientation must rely on the Legnano location alone. The ground floor is raised one metre above street level, and the first floor is reached by an internal stone staircase with bronze railings. No visitor accessibility information is documented.

The roof features two expansive terraces that were specifically designed for heliotherapy treatments. This practice was part of popular health and wellness ideas in the 1930s.