The second series of the British police procedural television programme Line of Duty, was broadcast on BBC Two between 12 February and 19 March 2014.

Line of Duty is a British police procedural and serial drama created by Jed Mercurio and produced by World Productions for the British Broadcasting Corporation (BBC). It first began broadcasting on BBC Two on 26 June 2012. The programme performed well and was quickly commissioned for additional series that aired in 2014 and 2016. After becoming the highest-rated series on BBC Two in 10 years, Line of Duty was promoted to BBC One beginning with the fourth series in 2017 and fifth in 2019, securing commissions through a sixth series, which concluded on 2 May 2021, after the programme had aired a total of 36 episodes.