John T. Lescroart ( /lɛsˈkwɑː/; born January 14, 1948) is an American author best known for two series of legal and crime thriller novels featuring the characters Dismas Hardy and Abe Glitsky.

Lescroart was born in Houston, Texas, and graduated from Junípero Serra High School, San Mateo, California (Class of 1966). He then went on to earn a B.A. in English with Honors at UC Berkeley in 1970. In addition to his novels, Lescroart has written several screenplays. He appeared as a contestant on the game show Tic Tac Dough in 1979 but lost his only game.

[It is strongly hinted in these books that Lupa (the son of Sherlock Holmes and Irene Adler) later becomes Nero Wolfe, although Wolfe is never mentioned by name.]

Lescroart's most popular works are a series of legal and crime dramas taking place in and around San Francisco, beginning with the thriller Dead Irish. They center around the adventures of ex-cop and lawyer, Dismas Hardy, and his best friend, officer Abe Glitsky, among many other friends and associates. His newest works introduce Wyatt Hunt, working as a private investigator. Although they are often performing together in the story, the books can be distinguished by which character is the main protagonist.