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- Christopher Langton (1949) is an American biologist and one of the founders of the field of artificial life.
- Ervin László (1932) is a Hungarian philosopher of science, systems theorist, integral theorist, and classical pianist.
- Loet Leydesdorff (1948) is a Dutch sociologist and cyberneticist, known for his work sociology of communication and innovation.
- Edward Norton Lorenz (1917) is an American mathematician and meteorologist, and an early pioneer of the chaos theory.
- Niklas Luhmann (1927–1998) was a German sociologist, who developed a systems theory applicable in political science from Talcott Parsons works.
Read more about this topic: List Of Systems Scientists