I so enjoyed the permanently grumpy, beer-swilling Inspector Morse that to this day I haven't been able to watch the final episode where he dies. It is impossible to imagine anyone other than the late John Thaw playing the classic Jaguar-driving detective (and that vintage red car was unforgettable). You can revisit his memorable cases on IMDb.

What made Morse so compelling was his mix of highbrow intellect and quiet vulnerability:

Sometimes the source books are fantastic but the adaptation falls flat, or vice versa. This is one brilliant case where the television series truly did Ellis Peters' books justice. Played flawlessly by Sir Derek Jacobi, Brother Cadfael brought herbal medicine and sharp observation to 12th-century mysteries. If you haven't caught up with the quintessential medieval sleuth yet, now is the perfect chance to discover the series.

Here is another classic detective where you simply cannot imagine another actor in the role. Peter Falk defined Lieutenant Columbo with his rumpled raincoat, cigar, and deceptive bumbling demeanor. The joy of the show was watching an arrogant guest star believe they had executed the perfect crime, only for Columbo to deliver his legendary phrase, 'Just one more thing...' Check out details on his guest stars on IMDb.

I have never quite been able to take Hercule Poirot entirely seriously, but the series is best enjoyed as an elegant period piece. David Suchet's portrayal of Agatha Christie's famous sleuth is masterclass television. Originating in stories written long before modern European travel was common, a Belgian detective in London felt delightfully exotic to readers and viewers alike. You can explore the full show episode guide on IMDb.

Poirot's key investigative philosophy:

Not one, but two formidable female leads! Sharon Gless and Tyne Daly broke ground for female detectives on network television. The male characters took supporting roles, and Cagney and Lacey were every bit as tough and resourceful as their male colleagues. The show also realistically portrayed the challenges of balancing family life, personal identity, and a demanding career in law enforcement.

This series, on the other hand, was pure escapist fun. Starring Robert Wagner and Stefanie Powers, it featured a wealthy, glamorous couple who solved high-society mysteries in between jet-setting adventures. While it was far removed from gritty realism, there is nothing wrong with stylish entertainment and romantic charm in a detective show.

Ah, the 1970s! From Paul Michael Glaser's chunky cardigans to the iconic red Ford Gran Torino with the white vector stripe, this action-packed duo defined police procedurals of the era. With one dark-haired, street-smart detective and one calm blonde partner, they offered something for every viewer. It remains a classic piece of pop-culture nostalgia worth rewatching.

The 1970s were truly a golden era for iconic TV sleuths. Telly Savalas made Lieutenant Theo Kojak a household name with his sharp suits, trademark lollipops, and signature catchphrase, 'Who loves ya, baby?' Even decades later, his charismatic performance remains legendary among television detectives.

With so many unforgettable sleuths on screen, narrowing them down is never easy. Which classic TV detective is your favorite, or is there another famous investigator you would add to this list?