Diena may refer to:

• Family of Italian philatelists:
  • Alberto Diena, (1894–1977)
  • Emilio Diena (1860–1941)
  • Enzo Diena (1927–2000)
  • Mario Diena (1891-1971)
• Armando Diena (1914 – 1985), Italian professional football player
• Ferruccio Diena (1912 – 1996), Italian professional football player

• Diena Georgetti (born 1966), Australian artist

• Diena, Mali, a town and commune in Mali
• Diena, a newspaper in Latvia
• Diena Media [lt], Lithuanian media group
  • Vilniaus diena
  • Kauno diena

• All pages with titles containing Diena