Ignition may refer to:

• Firelighting, the human act of creating a fire for warmth, cooking and other uses
• Combustion, an exothermic chemical reaction between a fuel and an oxidant
• Fusion ignition, the point at which a nuclear fusion reaction becomes self-sustaining
• Ignition SCADA, software by Inductive Automation
• Ignition! An Informal History of Liquid Rocket Propellants, a book by John Drury Clark

• Ignition (video game), a top-down racing game for PC published in 1997
• Ignition (2001 film), directed by Yves Simoneau
• Ignition Entertainment, a computer video games company founded in 2002
• Ignition! An Informal History of Liquid Rocket Propellants, (1972) by John Drury Clark

• Ignition (B1A4 album), 2012
• Ignition (Darude album), 2001
• Ignition (John Waite album), 1982
• Ignition (Mark Boals album), 1998
• Ignition (Nicky Romero album), 2014
• Ignition (The Offspring album), 1992
• Ignition (The Music Machine album)
• Ignition!, album by Brian Setzer, 2001
• Ignition, an album by American rapper X-Raided, 2007
• Ignition (EP), a 2012 EP by Unisonic

• "Ignition", a 2001 song by Nebula from the album Charged
• "Ignition (Remix)", a 2002 song by R. Kelly
• "Ignition", a song by Trivium from the album The Crusade, 2006
• "Ignition", a song by tobyMac from the album Portable Sounds, 2007–08
• "Ignition", a 2013 song by Dutch DJ and producer Nicky Romero.

• Ignition system, a method for activating and controlling the combustion of fuel in an internal combustion engine.
• Ignition switch, a switch in the control system of a motor vehicle that activates the main electrical systems for the vehicle.

• Ignition (event), a Burning Man regional event held in Montreal, Quebec, Canada

• National Ignition Facility, fusion research facility at the Lawrence Livermore National Laboratory in Livermore, California, US
• Ignition coil, an induction coil in an automobile's ignition system that raises the battery's voltage to the levels necessary for a spark to ignite the fuel
• High energy ignition, an electronic ignition system used by General Motors from 1974 to the mid-1980s
• Ignition interlock device, a method for preventing a vehicle's engine starting if a driver is over the legal alcohol limit
• Ignite (disambiguation)
• Flammability limit
• Lower flammable limit