LP or lp may stand for:

• in corporate law or company names, limited partnership
• in chemistry, liquid propane
• the long play phonograph record format. (which was, during the 1970s and 1980s, the most popular record format—see vinyl record)
• Long Play (VCR format)
• MDLP, the long play format of the MiniDisc
• nu metal band, Linkin Park
• in politics:
  • the United States Libertarian Party
  • the Liberal Party of Australia
• in the dark-sky movement, light pollution
• in applied mathematics, linear programming (a fundamental optimization problem)
• the Larch Prover
• the Lincoln Park gambling establishment in Rhode Island
• Lonely Planet
• in mathematics, Lp space
• in popular usage in Taiwan, an abbreviation for testicles ("lan pa") in Taiwanese / Min Nan dialect, popularised by the use of this abbreviation when media outlets reported Taiwan's Minister of Foreign Affairs Mark Chen blasting Singapore over its pro-China stance [1]