Line of Duty series 5

The fifth series of the British police procedural television programme Line of Duty was broadcast on BBC One between 31 March and 5 May 2019. Following the fourth, it is the second series to air on the channel after the first three series aired on BBC Two.

The series follows Anti-Corruption Unit 12 (AC-12), a fictional law enforcement unit tasked with "policing the police". AC-12 is led by Superintendent Ted Hastings (Adrian Dunbar) who is assisted by his team DS Steve Arnott (Martin Compston) and DI Kate Fleming (Vicky McClure). Together, they lead an investigation into an organised crime group led by undercover officer John Corbett (Stephen Graham). Over the course of the case, Hastings himself becomes implicated as a suspect and is scrutinised by DCS Patricia Carmichael (Anna Maxwell Martin).

The series was initially commissioned following the third series. Line of Duty is written by Jed Mercurio who also serves as an executive producer. The six episodes were directed by John Strickland and Sue Tully. Filming took place in late 2018 with cinematography from Stephen Murphy. The series experienced a significant increase in viewing figures and was nominated for 18 awards, 9 of which were won, and received mostly positive reviews from critics. A sixth series followed in 2021.