Flatliner
Flatliner may refer to:

A person whose brain or cardiac activity is measured as a flatline
The Flatliner Band, a country band from Brighton, IL
The Flatliners, a Canadian ska punk rock band
Flat-Liner, Australian haunted heavy-rock band
4-Methylthioamphetamine, a psychoactive drug
Flatliners, a 1990 science fiction psychological horror film directed by Joel Schumacher
Flatliners (2017 film), a 2017 remake of the 1990 film, directed by Niels Arden Oplev
"Flatliner" (song), a song by Cole Swindell and Dierks Bentley
Another name for the Reverse STO, a professional wrestling move
Flatlinerz, a band

See also
Flatline (disambiguation)