Letitia Elizabeth Landon was an English poet and novelist, better known by her initials L.E.L.

Lettice Ulpha Cooper OBE was an English writer.

Letty Cottin Pogrebin is an American author, journalist, lecturer, and social activist. She is a founding editor of Ms. magazine, the author of twelve books, and was an editorial consultant for the TV special Free to Be... You and Me for which she earned an Emmy.

Leucippus was a pre-Socratic Greek philosopher who has been credited as the first philosopher to develop a theory of atomism.

Lev Alexandrovich Anninsky was a Soviet and Russian literary critic, historian, publicist, essayist and author of more than 30 books. He was also a scriptwriter, and as such the three times TEFI laureate.

Lev Atamanov, born Levon Konstantinovich Atamanyan, was a Soviet Armenian animation director.

Lev Semyonovich Berg, also known as Leo S. Berg was a leading Russian geographer, biologist and ichthyologist who served as President of the Soviet Geographical Society between 1940 and 1950.

Lev Berinski (Yiddish: לעװ בערינסקי, Russian: Лев Беринский; Căușeni, Soviet Union, April 6, 1939) is an Israeli translator and poet.

Lev Moiseievich Bienstok was a Russian writer, educationist, and communal worker.

Lev Aleksandrovich Danilkin is a Russian writer and literary critic. He won the Big Book literary prize in 2017.