Hardline is a political label.
Hardline, Hard Line or hardliner may also refer to:
- Hard Line (album), a 1985 album by American band The Blasters
- Hardline (band), an American hard rock group
- Hardliner (band), a Canadian hard rock band
- Hardline coaxial cable
- Hardline (subculture), a militant offshoot of straight edge
- Hardline (video game), a video game developed by Cryo Interactive Entertainment in 1996
- Battlefield Hardline, a video game published by Electronic Arts in 2015.
- Hard Line (political party), a Danish far-right political party.