Grantchester is a British ITV detective drama set in the 1950s in the Cambridgeshire village of Grantchester. Its first series was broadcast in 2014. The series originally featured Anglican vicar Sidney Chambers (James Norton); subsequent series have featured vicar William Davenport (Tom Brittney) and vicar Alphy Kotteram (Rishi Nair). Each of them develops a sideline in sleuthing with the help of Detective Inspector Geordie Keating, played by Robson Green.

The series is based on The Grantchester Mysteries, collections of short stories written by James Runcie. The first series was based on the six stories from the first book, Sidney Chambers and the Shadow of Death. A second series aired in March and April 2016, and a third series began its run on 23 April 2017. A fourth series was announced on 12 April 2018, and it was confirmed that this would be the last to feature James Norton in the lead.

Tom Brittney as the Reverend Will Davenport took over the lead from Norton in series four. The fifth series commenced in January 2020. A sixth series was commissioned on 17 July 2020, and began transmission on 3 September 2021. A seventh series was commissioned on 28 July 2021; it started production in summer 2021 with Brittney also directing for the first time. It premiered on 11 March 2022 and concluded on 15 April 2022.

In August 2022, ITV announced that the drama had been commissioned for an eighth series, with Al Weaver directing for the first time, to be broadcast on ITV from 11 January 2024 to 15 February 2024, a year later than planned due to the scheduling conflicts.

A ninth series was announced in July 2023, with Brittney announcing it will be his final series. Taking his place will be actor Rishi Nair, as vicar Alphy Kotteram. A tenth series was announced on 18 June 2024 by Masterpiece on PBS.