OPL may stand for:

Computing and technology

  • Open Programming Language
  • Optical path length
  • Optimization Programming Language, a modelling language designed for the CPLEX Optimization software
  • FM Operator Type-L, a series of sound chips made by Yamaha:
  • YM3526 (OPL)
  • YM3812 (OPL2)
  • YMF262 (OPL3)
  • YMF278 (OPL4)

Libraries

  • Oakville Public Library, in Oakville, Ontario
  • Oshawa Public Library, in Oshawa, Ontario
  • Ottawa Public Library, in Ottawa, Ontario
  • One-person library
  • Omaha Public Library, in Omaha, Nebraska
  • Orem Public Library, in Orem, Utah

Sports

  • Oceanic Pro League, a former professional League of Legends league in Oceania
  • Oman Professional League, an association football league in Oman
  • Ontario Premier League, a Canadian association football league

Other

  • Luxembourg Philharmonic Orchestra, abbreviated to OPL
  • On Patrol: Live, an American docuseries that uses the abbreviation OPL
  • Optique & Précision de Levallois (1911-1964), a former French optical company
  • Open Publication License, license predating Creative Commons licenses
  • Operating lease
  • Organisation du Peuple en Lutte ("Struggling People's Organization"), a Haitian political party