Mickey Spillane's Mike Hammer(1958)

Certified public accountant Andy Barker reluctantly becomes a private investigator after he is mistaken for the former office tenant, who was a private eye.

Laura Holt, a licensed private detective, opens a detective agency but finds that potential clients refuse to hire a woman, however qualified. To solve the problem, Laura invents a fictitious male superior whom she names Remington Steele. Through a series of events that unfold in the first episode, "License to Steele," a former thief and con man, whose real name is never revealed, assumes the identity of Remington Steele. Behind the scenes, Laura remains firmly in charge.

Sherlock Holmes uses his abilities to take on cases by private clients and those that the Scotland Yard are unable to solve, along with his friend Dr. Watson.

Dex Parios is a strong, assertive, and unapologetically sharp-witted Army veteran working as a P.I. in Portland, Oregon. With a complicated personal history and only herself to rely on, she solves other people’s messes with a blind eye toward her own.

From England to Egypt, accompanied by his elegant and trustworthy sidekicks, the intelligent yet eccentrically-refined Belgian detective Hercule Poirot pits his wits against a collection of first class deceptions.

A private investigator who works when he wants, lives in a beachfront estate in Hawaii, drives a posh Ferrari, runs up an unlimited tab at a swank bar, and charms attractive women in peril - that's the lifestyle of Thomas Magnum, aka Magnum, P.I.

Gabriel's Fire is an American television series that ran on ABC in the USA in 1990–1991. A revamped version of the series, entitled Pros and Cons, aired briefly the following season.

Cranky but likable L.A. PI Jim Rockford pulls no punches (but takes plenty of them). An ex-con sent to the slammer for a crime he didn't commit, Rockford takes on cases others don't want, aided by his tough old man, his lawyer girlfriend and some shady associates from his past.

Mystery and suspense series based on Robert Parker's "Spenser" novels. Spenser, a private investigator living in Boston, gets involved in a new murder mystery each episode.

Despite their opposing personalities, a talented but directionless P.I. who is the black sheep of his family begrudgingly agrees to work as the in-house investigator for his overbearing mother, a successful attorney reeling from the recent dissolution of her marriage.

Sean King and Michelle Maxwell aren't your typical pair of private investigators. As discredited Secret Service agents, their unique skills often give them a leg up on suspects and conventional law enforcement. He's charming and always one step ahead of the game; she's a fearless force to be reckoned with. As a team, they're unstoppable.

Private detective Varg Veum lives, and is consulted in various criminal cases, in Bergen on the west coast of Norway.

The Law & Harry McGraw is an American mystery crime drama television series created by Peter S. Fischer and a spin-off of Murder, She Wrote. The series stars Jerry Orbach as a Harry McGraw, a loudmouthed, uncouth, old school private detective who continually finds himself solving mysteries on behalf of the prim and proper attorney Ellie Maginnis who has an office across the hall.

Jake Doyle and his ex-cop father, Malachy, run a Newfoundland detective agency. Their rugged seaside town never lacks for intriguing cases, and the Doyles don't always land on the right side of the law.

A modern day version of the 1969 detective series about Private Investigator Jeff Randall, who is aided in cases by the ghost of his deceased partner Marty Hopkirk.

Haunted is an American television program first aired in September 2002 on UPN. The program, which was filmed in Vancouver, was canceled in November 2002 due to low ratings. As a result, only seven of the completed episodes were aired. However, all eleven filmed episodes have subsequently been shown in international airings of the show. In August 2007, the series aired on HDNet. The series then began airing on Sci Fi in September 2007 and January 2008. In 2009, Chiller began airing this program as part of their daily marathon line-up. It plays there sporadically. A marathon of the entire series ran all day on October 31, 2010 on Universal HD.

The cases of a private investigations agency run by two Vietnam War veterans and their computer geek friend from high school, armed with toughness, their own helicopter, and the third's technical ability.

Frances Neagley is a private investigator in Chicago. When she learns that a beloved friend from her past has been killed in a suspicious accident, she becomes hell bent on justice. Using everything she's learned from Jack Reacher and her time as a member of the 110 Special Investigators, Neagley puts herself on a dangerous path to uncover a menacing evil.

Checkmate is an American detective television series starring Anthony George, Sebastian Cabot, and Doug McClure. The show aired on CBS Television from 1960 to 1962 for a total of 70 episodes and was produced by Jack Benny's production company, "JaMco Productions" in co-operation with Revue Studios. Guest stars included Charles Laughton, Peter Lorre, and Lee Marvin, among many other commensurately prominent performers.

A.J. Simon is a polished fellow with a taste for classic cars and tailored suits. Rick Simon is his less refined (but still pleasant) older brother who has a taste for cowboy boots and four-wheel drive pickups. The two of them live in San Diego, where they own a private detective agency.