Young Sherlock is a mystery television series that is created by Matthew Parkhill and developed by Peter Harness and Guy Ritchie who also directed episodes. It is inspired by Andrew Lane's Young Sherlock Holmes book series, itself a pastiche of Arthur Conan Doyle's original Sherlock Holmes stories. Hero Fiennes Tiffin stars as Holmes. The series premiered on Amazon Prime Video on 4 March 2026.
As a 19-year-old at Oxford University, Sherlock Holmes is not yet the master detective he grows up to be. He is raw and unfiltered, and he lacks discipline. A murder at Oxford puts Holmes's freedom at risk, and he sets out to solve his first murder mystery that leads him to a global-level conspiracy.
Development of a television series adaptation of the Young Sherlock Holmes books written by Andy Lane was first reported in April 2024 with Hero Fiennes Tiffin starring as a young Sherlock Holmes and Guy Ritchie attached to the project as well. Amazon Prime Video ordered eight-episodes of the series in May 2024 to be executive produced by Inspirational Entertainment and Motive Pictures. The series was written by showrunner Matthew Parkhill, who also executive produces. Ritchie directs and executive produces alongside Lane, Simon Kelton, Ivan Atkinson, Simon Maxwell, Harriet Creelman, Dhana Gilbert, Colin Wilson and Marc Resteghini. Ritchie previously helmed two unrelated cinematic Holmes adaptations: Sherlock Holmes (2009) and ' (2011). The role of the nineteen-year-old Holmes is played by Hero Fiennes Tiffin, who had previously worked with Ritchie on The Ministry of Ungentlemanly Warfare.
In June, Fiennes Tiffin's uncle Joseph Fiennes was cast as Sherlock's father, alongside Natascha McElhone as his mother. In July, Zine Tseng, Colin Firth and Dónal Finn joined the cast. Max Irons was seen filming scenes in late August, and he was revealed to be playing Mycroft Holmes shortly afterwards.
Filming of the series began in the United Kingdom in July 2024. Scenes were filmed in Bristol. In 2024, filming took place in Spain (specifically Jerez, Cádiz and Seville), and Cardiff, Wales. Filming on the series wrapped in late February 2025.
All eight episodes of Young Sherlock premiered on 4 March 2026 on Amazon Prime Video. On 9 February 2026 there was a New York premiere screening. The trailer for the series, which was released on 5 February 2026, set a new record for the most watched Amazon Prime Series trailer in its first seven days. On 17 February 2026 there was a premiere of 2 episodes in Mexico City. On 24 February there was a premiere of the series in London. The show's success led executive producer Marc Resteghini to extend their overall deal with Amazon MGM Studios.
On the review aggregator website Rotten Tomatoes, the series holds an approval rating of 83% based on 45 reviews. The website's critics consensus reads, "Young Sherlock doesn't aim to recreate Conan Doyle's work, rather, it takes pride in its liberal adaptation, delivering Guy Ritchie's signature blend of precise entertainment, sly style, and ingratiating characters". Metacritic, which uses a weighted average, gave a score of 66 out of 100 based on 17 critics, indicating "generally favorable reviews". While Tiffin has generally received praise for his perfomance as Young Sherlock, critics have felt Finn was more charismatic as James Moriarty stealing the spotlight.