Diena is a surname.
Family of Italian philatelists:
Alberto Diena, (1894–1977)
Emilio Diena (1860–1941)
Enzo Diena (1927–2000)
Mario Diena (1891-1971)
Adriano Diena (1857–1943), Italian politician
Armando Diena (1914 – 1985), Italian professional football player
Marisa Diena (1916-2013), Italian-Jewish resistance fighter in World War II
Ferruccio Diena (1912 – 1996), Italian professional football player