Nef Lucien Belloni, Sports stadium in L'Île-Saint-Denis, France.

Nef Lucien Belloni is a sports hall with a distinctive boat-shaped silhouette in L'Île-Saint-Denis. The structure features a hyperbolic paraboloid roof suspended between two oblique arches, making it a striking example of post-war architecture.

The hall was built between 1968 and 1971 on the grounds of the former Menier chocolate factory. In 2007, the Ministry of Culture granted the building heritage monument status, recognizing its architectural importance.

The hall's name honours Lucien Belloni (1924–2000), a metalworker, Resistance veteran and communist councillor who oversaw youth and sports in Saint-Ouen from 1953 to 1983; it was given in 2005 during the town's liberation celebrations. The building also serves as the logo of Saint-Ouen's tourist office and appears in Marc Fouchard's 2018 film Break and the 2021 mini-series Un homme d'honneur.

The hall reopened on 28 June 2025 after renovation, inaugurated in the presence of sports minister Marie Barsacq. It is set to host some Metropolitans 92 basketball games in the following months, while the adjoining pool is due for renovation by Plaine Commune by 2027. The building stands on the southern tip of L'Île-Saint-Denis, reached from Saint-Ouen-sur-Seine.

The roof is a remarkable technical achievement using tensioned cables between two oblique arches, allowing engineers of that era to create large open spaces without columns. This innovative construction method was groundbreaking for the 1970s.