A lie is a type of deception, an untruth or not telling the truth.

Lie, LIE or A Lie may also refer to:

• Interstate 495 (New York), also called the Long Island Expressway or LIE
• Liechtenstein, IOC country code LIE

• Lie (surname)
• Saint Lié (died 533)

• Lie (film) (Telugu లై), a 2017 Indian film
• L.I.E. (film), a 2001 LGBT film revolving around the Long Island Expressway
• "Lies, Lies, Lies", an episode of the American sitcom Herman's Head

• "Lie" (Black Light Burns song)
• "Lie" (Lukas Graham song)
• "Lie" (NF song)
• "L.I.E", a song by EXID from Street, 2016
• "Lie", a song by BTS from Wings
• "Lie", a song by Dream Theater from Awake
• "Lie", a song by Halsey from Hopeless Fountain Kingdom
• "Lie", a song by T-ara from Absolute First Album
• "A Lie", a song by French Montana
• "A lie", a song by B1A4 from Good Timing, 2016
• Lie: The Love and Terror Cult, an album by Charles Manson

• Carathéodory–Jacobi–Lie theorem
• Law of iterated expectations, or law of total expectation, initialized as LIE, a probability, statistical concept
• Lie algebra
• Lie bracket of vector fields
• Lie derivative
• Lie group
  • Group of Lie type
• Lie sphere geometry
• Lie theory

• Lie (obstetrics), an obstetrical term for the axis of the foetus
• Lie, topography or surface characteristics at a golf course
• Liquid impingement erosion, or LIE, alternate name for Water droplet erosion, or WDE, a form of materials wear
• Logical Intuitive Extrovert, or LIE, in socionics
• Lying (position), the recumbent position of the human body

• Liar (disambiguation)
• Lye (disambiguation)
• The Lie (disambiguation)
• LI3 (disambiguation)