Humans and animals

• In eye color, an extremely rare coloring of the iris
• Red eyeshine
• Red eye (medicine), a medical symptom in which the sclera (white part) of someone's eye appears red in colour
• Pink eye

Photography

• Red-eye effect, the appearance of red eyes in photos due to the use of a flash

Place names

• Red Eye Township, Minnesota
• Redeye River, a river in Minnesota

Music

• 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

Other entertainment and media

• Red Eye (film), a 2005 United States film
• Red Eye (Korean film), a 2005 South Korean horror movie
• Red Eye (drug), 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 the Fox News Channel
• Redeye (radio), current affairs program on Vancouver Co-operative Radio, CFRO-FM
• RedEye, a Chicago newspaper

Food and drink

• 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 (Canadian drink), a mixture of beer and Clamato/tomato juice.
• Red Eye (energy drink), energy drink from Australia

Other

• 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