The first season of True Detective, an American anthology crime drama television series created by Nic Pizzolatto, premiered on January 12, 2014, on the premium cable network HBO. The principal cast consisted of Matthew McConaughey, Woody Harrelson, Michelle Monaghan, Michael Potts, and Tory Kittles. The season comprised eight episodes, and its initial airing concluded on March 9, 2014. As an anthology, each True Detective season has its own self-contained story, following a disparate set of characters in various settings.

Constructed as a nonlinear narrative, season one focuses on Louisiana State Police homicide detectives Rustin "Rust" Cohle (McConaughey) and Martin "Marty" Hart (Harrelson), who investigated the murder of prostitute Dora Lange in 1995. Seventeen years later, they must revisit the investigation, along with several other unsolved crimes. During this time, Hart's infidelity threatens his marriage to Maggie (Monaghan), and Cohle struggles to cope with his troubled past. True Detective's first season explores themes of philosophical pessimism, masculinity, and Christianity; critics have analyzed the show's portrayal of women, its auteurist sensibility, and the influence of comics and weird horror fiction on its narrative.

Pizzolatto initially conceived True Detective as a novel, but felt it was more suitable for television. The episodes, directed by Cary Joji Fukunaga, were filmed in Louisiana over a three-month period. The series received positive reviews from critics and was cited as one of the strongest dramas of the 2014 television season.