Flatline may mean:

• Flatline, an electrical time sequence measurement that shows no activity. Thus:
  • In heart function, asystole
  • In brain function, a flat electroencephalogram, where the brain shows no electrical activity (brain death)

• Flatline (album), a 1997 album by MC Breed
• "Flatline" (B.o.B song), 2016
• "Flatline" (Mutya Keisha Siobhan song), 2013, re-released in 2022
• "Flatline" (Nelly Furtado song), 2017
• "Flatline", a song by 5 Seconds Of Summer from 5SOS5
• "Flatline", a song by Justin Bieber from Journals

• "Flatline" (Doctor Who), 2014 TV episode
• Flatline, Tippmann company's Flatline Barrel System for paintball
• Flatlining, budget freeze
• Flatline (Transformers), a fictional character in the Transformers universe
• Flatline (drink), a shot made from sambuca, tequila and Tabasco sauce

• Flatliner (disambiguation)
• Flat (disambiguation)

This disambiguation page lists articles associated with the title Flatline.
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