Red eye, red-eye, redeye or variants may refer to:

• Red-eye effect, in photographs
• Red eye (medicine), an eye that appears red due to illness or injury
• Red, an extremely rare eye color due to albinism
• Red eyeshine in animals caused by tapetum lucidum

• Red Eye, in video game Last Bronx
• The Red Eye, in The Tick comics
• Red Eye, the sub-boss from Sonic & Knuckles

• Red Eye (2005 American film), a psychological thriller
• Red Eye (2005 South Korean film), a horror film
• Red Eyes (film), a 1982 Canadian thriller drama film
• Red Eye (talk show), an American TV show
• Red Eye (British TV series), a 2023 thriller series
• Red Eye Radio, an American talk radio show

• Redeye Distribution, an American record label
• Red Eye Records (label), an Australian record label
• Redeye (band), an American rock group
• "Red Eye", a song by Ace Enders from The Secret Wars, 2008
• "Red Eye", a song by Andy Grammer from Magazines or Novels, 2014
• "Red Eye", a song by Big K.R.I.T. from 4eva N a Day, 2012
• "Red Eye", a song by Devo from Duty Now for the Future, 1979
• "Red Eye" (Justin Bieber song), 2021
• "Red Eye", a song by Kid Cudi from Indicud, 2013
• "Red Eye", a song by Styles P from Float, 2013
• "Red-Eye", a song by The Album Leaf from Into the Blue Again, 2006
• "Red Eye" (YoungBoy Never Broke Again song), 2021
• "Red Eyes" (song), by Karan Aujla, 2020
• "Red Eyes", a song by The War on Drugs from Lost in the Dream, 2014

• Red Eyes (manga), 2000-present
• Redeye (comics), a comic strip by Gordon Bess

• Red eye (drink), a coffee drink
• Red eye (cocktail)
• Red-eye gravy, a thin sauce

• Red Eye Township, Wadena County, Minnesota, U.S.
• Redeye River, Minnesota, U.S.

• RedEye, a Chicago newspaper
• common name of the snake Agkistrodon contortrix mokasen
• common name of the snake Agkistrodon laticinctus
• FIM-43 Redeye, a man-portable surface-to-air missile system
• Red-eye flight, a flight scheduled to depart at night and arrive the next morning
• Paul Chaloner (born 1971), known as ReDeYe or Redeye, esports broadcast host
• Red Eye, a charity founded by Justin Mayo

• All pages with titles containing red eye
• Conjunctivitis, or "pink eye"
• Sauron, a character in J. R. R. Tolkien's The Lord of the Rings