Red eye or Redeye may have one of the following meanings:
- eye color, an extremely rare coloring of the iris.
- Red eye (medicine), a medical symptom in which the sclera (white part) of someone's eye appears red in colour
- Red Eye Township, Minnesota
- Redeye River, a river in Minnesota
- Red-eye effect, the appearance of red eyes in photos due to the use of a flash
- The Red Eye wide angle adapter for video cameras developed by Collinscraft Canada 1994
- RedEye Distribution, a record distributor
- Red Eye Records, a record label
- Redeye (band), a 1970s rock group
- "Redeye", an electronic band from Manchester, England
- "Red Eye", a song by the band Devo from their album Duty Now for the Future
In other entertainment and media:
- Red Eye (film), a 2005 United States film
- Red Eye (Korean film), a 2005 South Korean horror movie
- Red Eye, a drug in the anime Cowboy Bebop
- The RedEye dinosaur tribe in the Star Fox Adventures video game.
- Red-Eyes Black Dragon, a card from Yu-Gi-Oh popularized by the character Joey Wheeler
- Redeye (comics), a comic strip by Gordon Bess
- Red Eye w/ Greg Gutfeld, a late night comedy talk show on Fox News Channel
- Redeye (radio), current affairs program on Vancouver Co-operative Radio, CFRO-FM
- RedEye, a Chicago newspaper
In food and drink:
- Red-Eye or "Calgary Red-Eye", a drink that is a variant of a Bloody Mary, made of beer and tomato juice
- Red-eye gravy, a sauce used in the cuisine of the Southern United States
- Red eye (drink), a cup of coffee with a shot of espresso in it
- Red-Eye (energy drink), energy drink from Australia
- FIM-43 Redeye, a type of US surface-to-air missile common in the Vietnam War
- Red-eye flight, an airplane flight that departs between 09:00 PM and 05:00 AM local time
- Paul Chaloner, a video game tournament commentator also known as "ReDeYe"
- Agkistrodon contortrix laticinctus, a.k.a. the broad-banded copperhead; a venomous viper found in the United States.
- Agkistrodon contortrix mokasen, a.k.a. the northern copperhead; a venomous viper found in the United States.