Flies are insects of the order Diptera.

Flies may also refer to:

• Bernhard Flies, 18th century amateur composer and doctor of medicine
• The Flies, nickname of NASA Astronaut Group 23

• "Flies" (Asimov short story) (1953), by Isaac Asimov
• "Flies" (Silverberg short story) (1967), by Robert Silverberg
• The Flies (1943), a play by Jean-Paul Sartre

• The Flies (English band), an English psychedelic pop band
• The Flys (American band), an American post-grunge group
• The Flys (British band), an English punk band
• "Flies (song)", by Death Grips from Year of the Snitch
• "Flies", by Red Fang from Only Ghosts
• Fly (Blind Guardian song), a song from the band Blind Guardian

• Fly (disambiguation)
• The Fly (disambiguation)