12 Days may refer to:

• 12 Days (book), graphic novel/global manga by June Kim
• 12 Days (film), French documentary
• Twelve days of Christmas, holiday period
  • "The Twelve Days of Christmas" (song)
  • The Twelve Days of Christmas (disambiguation)

See also:

• 12 Days of Terror, film
• 12 Days of Brumalia, music event
• "The 12 Days of Christine", episode of Inside No. 9