L
- Magdalene La Batarde is a whoremistress in 12th century London in books by Roberta Gellis, who is also an influential historical romance writer.
- Mary Beth Lacey is a New York City police detective played by Tyne Daly on the 1982-1988 CBS series Cagney & Lacey.
- Meg Lacey is a private investigator in Vancouver in two books 1988 and 1991 by Elisabeth Bowers.
- Skip Langdon is a former debutante turned police officer in New Orleans in a series by Julie Smith, starting with "New Orleans Mourning" (1990).
- Meg Langslow is an amateur investigator in a series of books by American crime novelist Donna Andrews (debuted 1999).
- Charlotte La Rue is a house cleaner and investigator in New Orleans in a series by Barbara Colley.
- Lauren Laurano is a lesbian private eye in novels by Sandra Scoppettone 1991-1999.
- Jane Lawless is a restaurateur and amateur investigator in a series of books by American crime novelist Ellen Hart (debuted 1989).
- Loretta Lawson is an amateur investigator in a series of books by English journalist and crime novelist Joan Smith (debuted 1987).
- Aimee Leduc is a French-American private investigator in contemporary Paris in a series commenced 1998 by Cara Black.
- Anna Lee is a private investigator in a series of books by English crime novelist Liza Cody (debuted 1980); played by Imogen Stubbs on the 1993-1994 LWT series Anna Lee.
- Gypsey Rose Lee, the famous stripper, is also an amateur sleuth, in two books 1941 and 1942 by Craig Rice, nom de plume of Georgianna Ann Randolph.
- Judith Lee was a teacher of the deaf who used lip reading skills and jujitsu to help her investigations, in fiction by Richard Marsh, starting 1916.
- Madison Lee is a former private detective played by Demi Moore in the 2003 film Charlie's Angels: Full Throttle.
- Adrienne Lesniak is a New York City detective played by Justine Miceli on the ABC series NYPD Blue from 1994 to 1996.
- Catherine LeVendeur is a novice in a convent in 12th Century France who appears in a series of historical mystery novels by Sharan Newman.
- Ingrid Levin-Hill is 13 year-old who is mixed up in mysteries in her home town of Echo Falls, in a book series for children aged 10+ debuted 2006 by Peter Abraham.
- Gilda Liberty is the owner manager of a crumbling movie palace and investigates movie-themed murders in three books 1999-2001 by 'Della Borton' (Dr Lynette Carpenter who also writes as D B Borton).
- Janice Licalsi is a New York City detective played by Amy Brenneman on the ABC series NYPD Blue from 1993 to 1994.
- Gemma Lincoln runs a security firm in Sydney, Australia, a series beginning 1999 by Gabrielle Lord.
- Sarah Linden see Sarah Lund.
- Ann Lindell is a police detective in a series of books by Swedish crime novelist Kjell Eriksson (debuted 1993).
- Carol Lipton is a middle-aged Manhattanite, played by Diane Keaton, who drags her husband Larry and some friends into helping her investigate the supposed death of a neighbour in Woody Allen's 1993 Manhattan Murder Mystery.
- Dr Eve Lockhart is a forensic pathologist assigned to a cold case squad in the British TV series Waking the Dead, subsequently the lead character in The Body Farm, a spin off series.
- Kate Lockley was a Los Angeles police detective played by Elizabeth Rohm on the WB television network series Angel from 2000 to 2001.
- Darcy Lott is a movie stunt double in a book series debuted 2006 by Susan Dunlap.
- Rita Lucero is a pastry chef in New Orleans in a 2011 book by Jacklyn Brady, the first in a new culinary series.
- Sarah Lund is a police Detective Inspector, played by Sofie Gråbøl, in a 2007 Danish television series The Killing (Forbrydelsen) in which each episode covers a day in the investigation of a murder. A second Danish series was broadcast in 2009. The series was re-made in English for AMC and broadcast in 2011 with Mireille Enos playing the lead detective, renamed Sarah Linden, with the story transposed to Seattle.
- Josefina "Jo" Lupo is a former US Army Ranger and current Eureka town deputy played by Erica Cerra on the 2006-present Syfy series Eureka.
Read more about this topic: List Of Female Detective Characters