Leonard "Lennie" Briscoe (played by Jerry Orbach) was a fictional character on NBC's long running drama, Law & Order for 12 seasons from 1992 to 2004.

Lennie worked for the 27th Precient division of the New York City Police Department as a police detective. His boss during his first year on duty was Captain Donald Cragen, later Lt. Anita Van Buren. He had two daughters named Cathy and Julia (Cathy was the oldest and killed in an episode called "Damaged"; Julia has been mentioned many times but has never appeared onscreen), and a nephew, Detective Ken Briscoe (played by Chris Orbach , Jerry Orbach's son), who appeared on early episodes of Law & Order: SVU).

Briscoe first appeared on the show's third season, after Detective Mike Logan's partner Phil Cerreta was shot by a black-market arms dealer and was forced to retire. Since then, Briscoe became one of the most two popular characters over the 15-year history of the show (the other being Executive Assistant District Attorney Jack McCoy). Logan was eventually expelled to Staten Island in 1995, and was replaced with Detective Reynaldo Curtis (later, Detective Ed Green in 1999).

In 2004, Lennie retired from the detective business, and went to become a District Attorney Investigator with partner Hector Salazar, for DA Arthur Branch. Briscoe died in 2005; his death will be mentioned on the fifth episode on the new Law & Order: Trial by Jury program.