Sherlock is a crime drama television series based on Sir Arthur Conan Doyle's Sherlock Holmes detective stories. Created by Steven Moffat and Mark Gatiss, it stars Benedict Cumberbatch as Sherlock Holmes and Martin Freeman as Doctor John Watson. Thirteen episodes have been produced, with three-part series airing in 2010, 2012, 2014 and 2017, and a special episode airing on 1 January 2016. The series is set in the present day, while the one-off special features a Victorian period fantasy resembling the original Holmes stories. Sherlock is a co-production of the British network BBC and the American station WGBH Boston for its Masterpiece anthology series on PBS, along with Hartswood Films, with Moffat, Gatiss, Sue Vertue and Rebecca Eaton serving as executive producers. The series is primarily filmed in Cardiff, Wales, with North Gower Street in London used for exterior shots of Holmes and Watson's 221B Baker Street residence.

Critical reception has been highly positive, with many reviews praising the quality of the writing, performances, and direction. Sherlock has been nominated for numerous awards including BAFTAs, Emmys, and a Golden Globe, winning several awards across a variety of categories. The show won in three categories at the 66th Primetime Emmy Awards including Outstanding Writing for a Miniseries, Movie or a Dramatic Special for Moffat, Outstanding Lead Actor in a Miniseries or a Movie for Cumberbatch, and Outstanding Supporting Actor in a Miniseries or a Movie for Freeman. Two years later, it won Outstanding Television Movie. In addition, the show was also honoured with a Peabody Award in 2011.The third series has become the UK's most watched drama series since 2001. Sherlock has been sold to 180 territories.

All of the series have been released on DVD and Blu-ray, alongside tie-in editions of selected original Conan Doyle stories and original soundtrack composed by David Arnold and Michael Price. In January 2014, the show launched its official mobile app called Sherlock: The Network.