Liner or LINER may refer to:
In line drawing:
- Eye liner, a type of makeup
- Liner, a sable brush used by coach painters
In linings:
- Acoustic liner, a perforated metal sheet used to lower the noise of aircraft engines by the principle of Helmholtz resonance
- Bin liner, an item used as a protective layer fitted inside of a bin or another object
- Landfill liner, a membrane placed at the bottom of landfills
- Liner, an installation of well-drilling casing that does not extend to the surface
- Release liner is a paper or film used on labels and adhesive tapes to cover the adhesive until ready for use
In transportation:
- Airliner, a large fixed-wing aircraft for transporting passengers and cargo
- Ocean liner, a type of modern-day passenger ship
- Cruise ship, also known as a cruise liner
- Superliner (passenger ship), an ocean liner over 10,000 gross tons
- Ship of the line, an archaic term, a type of warship used from the 17th century to the 19th century
Other:
- Liner (baseball), or line drive, a type of batted ball, sharply hit, and on a level trajectory
- Linerboard, or just liner is a type of paperboard, used in making corrugated fiberboard
- Low-ionization nuclear emission-line region (LINER), a class of galactic nuclei (also used to refer to galaxies with such nuclei)