LLL may refer to:
Arts and entertainment Leisure Suit Larry in the Land of the Lounge Lizards, the first of a series of video games Love's Labour's Lost, a comedy by William Shakespeare Landau, Luckman, and Lake, a fictional holding company in Marvel Comics "L. L. L.", a 2015 song by Myth & Roid The Sea Devils, a 1972 Doctor Who serial (production code LLL)
Businesses and organisations L3 Technologies, an American defense contractor formerly with the NYSE stock symbol LLL La Leche League, an organization that promotes breastfeeding Lambda Lambda Lambda, a co-ed fraternity Loyal Lusitanian Legion, a foreign volunteer corps of the British Army, that fought in the Peninsular War Lutheran Laymen's League, also known as Lutheran Hour Ministries, a Christian outreach ministry
Science and technology Low-level programming language, such as machine code or assembly Lenstra–Lenstra–Lovász lattice basis reduction algorithm, a polynomial time lattice reduction algorithm Lowest Landau level, wave functions in quantum mechanics Lovász local lemma, a lemma in probability theory Lawrence Livermore Laboratory, now known as Lawrence Livermore National Laboratory, a scientific research laboratory in the US One of the programming languages used in Ethereum
Other uses LL.L (Legum Licentiatus), a degree in civil law at various Canadian universities (especially in Québec) Lifelong learning "Lunatic, Liar, or Lord", a common summary of Lewis's trilemma, a theological argument from C. S. Lewis
See also L3 (disambiguation) 3L (disambiguation) LL (disambiguation) LLLL (pronounced "four-el"), stage name of Kazuto Okawa, a Japanese musician