Halo may refer to:

• Halo (religious iconography), a glow or ring of light around a head or person in art

• HALO jump, a High Altitude-Low Opening parachute jump
• HALO Technology Holdings, a parent company of several long established technology sector companies
• HALO Trust, an organization to remove war debris

• Halo (bar), a gay bar in Washington, D.C., United States
• Halo Dogs, The largest dog daycare centre in the world, London UK
• Los Angeles Angels of Anaheim, a baseball team, nicknamed "the Halos"
• A vehicle wireless charging standard by Qualcomm

• Halo (optical phenomenon), an atmospheric light effect produced by ice crystals
• Galactic halo, an extended, roughly spherical component of a galaxy which extends beyond the main, visible component
• Heiligenschein an optical phenomenon giving a bright spot around a shadow, created when the surface on which the shadow falls has special optical characteristics
• Halo nucleus, of orbiting protons or neutrons
• Halo orbit, a periodic, three-dimensional orbit
• Halo- (disambiguation), a chemical prefix
• Halo (mathematics), a concept in the theory of hyperreal numbers
• Halo (medicine), a cervical brace
• Halo sign, a finding on ultrasound that suggests the diagnosis of temporal arteritis
• Halo Project (Project Halo), computer science "digital Aristotle"

• Halo (G.I. Joe), a fictional member of the Phoenix Guard in G.I. Joe: America's Elite
• Halo (comics), a DC Comics superheroine

• Halo (1996 film), a 1996 Indian film
• Halo (2007 cancelled film), a never produced film adaptation of the Halo video game series
• Halo 4: Forward Unto Dawn (2012 film), a science fiction action film set in the universe of the Halo franchise

• Halo (series), a video game franchise by Bungie, 343 Industries, and Microsoft Game Studios
  • Halo: Combat Evolved, the first game in the series commonly referred to only as Halo
  • Halo (megastructure), the megastructure that is the center of the game's canon and from which it is named
  • Halo (board game), strategy games based on the Halo universe

• Halo (Christian rock band), an American group
• Halo (metal band), an Australian drone/sludge metal band
• Halo (UK band), a rock group
• Halo Circus

• "Halo" (Beyoncé song), 2008
• "Halo" (Machine Head song), the third single from the album The Blackening by Machine Head
• "Halo" (Red Flag song)
• "Halo" (Soil song), the first single off metal band Soil's second studio album, Scars
• "Halo" (Texas song), 1997

• "Halo", a song by Bethany Joy Galeotti on the album Friends with Benefits: Music from the Television Series One Tree Hill, Volume 2
• "Halo", a song by Bloc Party on the album Intimacy
• "Halo", a song by The Cure on the album Join the Dots
• "Halo", a song by Depeche Mode on the album Violator
• "Halo", a song by Endless Shame on the album Generation Blind
• "Halo", a song by Foo Fighters on the album One by One
• "Halo", a song by Linkin Park from the 2010 Linkin Park Underground EP LP Underground X: Demos
• "Halo", a song by Porcupine Tree on the album Deadwing
• "Halo", a song by The Pussycat Dolls on the album Doll Domination
• "Halo", a song by Takida on the album Bury the Lies
• "Halo", a song by Tinchy Stryder on the album Catch 22
• "Halo", a song by Slash on the album Apocalyptic Love
• "Haloes", a song by The Tubes on the album The Tubes

• Halo (Current 93 album), a live album, released in 2004, by Current 93
• Halo (Azonic album), 1994 Azonic album

• Halo numbers, a numbering system used by industrial rock band Nine Inch Nails to organize official releases; see Nine Inch Nails discography#Chronology.
• Halo Records, a record label

• Halo, the NATO reporting name for the Mil Mi-26 helicopter
• Halo (horse) (1969–2000), American Thoroughbred racehorse
• Halo, Kentucky
• Halo, West Virginia, United States
• Halo, a move used in the dance b-boying
• Halo, in non-standard analysis, describes the set of points infinitely close to a given point
• Halo antenna, a common omni-directional antenna
• Halo effect, a type of cognitive bias
• Halo, a certain type of automobile headlamp
• Halo or hallo, an informal greeting in some languages, often used when answering the telephone
• Halo Meadows (1905–1985), American actress, writer and burlesque dancer
• Halo Corporation, a fictional company appearing in Wildstorm comics
• HALO, an early IBM PC graphics software for third party graphic boards, published by Media Cybernetics in 1982.

• "Halo, Halo"