Halo generally refers to:

• Halo (optical phenomenon)
• Halo (religious iconography), a glow or ring of light around a head or person in art or a ring above one's head
• Halo (franchise), a video game franchise

Halo or HALO may also refer to:

• Halo (bar), a gay bar in Washington, D.C., United States
• HALO Technology Holdings, a parent company of several long established technology sector companies
• HALO Trust, an organization to remove landmines and other war debris
• Los Angeles Angels or the Halos, a baseball team

• Halo (1996 film), a Indian film
• Halo (2007 cancelled film), an unproduced film adaptation of the Halo video game series

• Halo (franchise), a military science fiction video game franchise commonly referred to only as Halo
• Halo (megastructure), the center of the game's canon and from which it is named
• Halo (board game), a line of strategy games based on the Halo universe

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

• Halo (Christian rock band), an American band
• Halo (metal band), an Australian drone/sludge metal band
• Halo (UK band), a rock band
• HALO (South Korean group), a boy group

• "Halo" (Beyoncé song) (2008)
• "Halo" (Machine Head song) (2008)
• "Halo" (Red Flag song) (2008)
• "Halo" (Soil song) (2001)
• "Halo" (Texas song) (1997)
• "Halo", a song by Basement from Promise Everything
• "Halo", a song by Bloc Party from Intimacy
• "Halo", a song by Cage the Elephant from Melophobia
• "Halo", a song by the Cure from Join the Dots
• "Halo", a song by Depeche Mode from Violator
• "Halo", a song by Endless Shame from Generation Blind
• "Halo", a song by Foo Fighters from One by One
• "Halo", a song by Bethany Joy Galeotti from Friends with Benefits: Music from the Television Series One Tree Hill, Volume 2
• "Halo", a 2010 song by Linkin Park from LP Underground X: Demos
• "Halo", a song by Porcupine Tree from Deadwing
• "Halo", a song by the Pussycat Dolls from Doll Domination
• "Halo", a song by Slash from Apocalyptic Love
• "Halo", a song by Starset from Transmissions
• "Halo", a song by Tinchy Stryder from Catch 22
• "Halo", a song by Takida from Bury the Lies
• "Haloes", a song by the Tubes from The Tubes

• Halo (Current 93 album) (2004)
• Halo (Azonic album) (1994)
• Halo (Juana Molina album) (2017)
• Halo, by Severina (forthcoming, 2019)

• Halo (safety device), a component of open-wheel racing cars for protecting the driver's head
• Halo antenna, a common omnidirectional antenna
• HALO jump, a High Altitude-Low Opening parachute fall
• Halo nucleus, of orbiting protons or neutrons
• Project Halo, an artificial intelligence project of Vulcan Inc.
• Mil Mi-26 or Halo, a helicopter
• Halo, a vehicle wireless charging standard by Qualcomm
• Halo, a type of automobile headlamp
• Halo-, a prefix indicating the names of compounds which contain one or more halogen atoms

• Dark matter halo, a theoretical component of a galaxy that envelops the galactic disc and extends well beyond the edge of the visible galaxy
• Galactic halo, an extended, roughly spherical component of a galaxy which extends beyond the main, visible component
• Halo orbit, a periodic, three-dimensional orbit
• Helium and Lead Observatory, a supernova neutrino detector

• Halo (mathematics), a concept in the theory of hyperreal numbers
• Monad (non-standard analysis) or halo, the set of points infinitely close to a given point

• Halo (medicine), a cervical brace
• Halo sign, a finding on ultrasound that suggests the diagnosis of temporal arteritis

• Halo, Kentucky
• Halo, West Virginia, United States

• Halo (artwork)
• Halo (b-boy move), a move used in the dance b-boying
• Halo (comics), a DC Comics superheroine
• Halo (horse) (1969–2000), an American Thoroughbred racehorse
• Halo (marketing), a business technique
• Halo Corporation, a fictional company appearing in Wildstorm comics
• Halo, a fictional member of Wild Weasel's Phoenix Guard in G.I. Joe: America's Elite

• Halo Meadows (1905–1985), American actress, writer and burlesque dancer

• "The Ballad of Halo Jones", a science fiction comic strip written by Alan Moore
• Halation, a problem in photography
• Hallo (disambiguation)
• Halo effect, a type of cognitive bias
  • Health halo, a specialized halo effect regarding food choices
• "Halo, Halo", a song that placed 14th of 18 entries in a 1982 contest
• Heiligenschein an optical phenomenon giving a bright spot around a shadow, created when the surface on which the shadow falls has special optical characteristics
• Helo (disambiguation)
• All pages with titles beginning with Halo
• All pages with titles containing Halo