Sir Nigel Hamilton Sweeney KC (born 18 March 1954), styled The Hon.

[3][4] Prior to being appointed a High Court judge, Sweeney was a barrister in the United Kingdom, practising from 6 King's Bench Walk and specialising in terrorism, official secrets, murder and major health and safety trials.

[10] He presided over the trial in February and March 2013 of former Secretary of State for Energy and Climate Change Chris Huhne MP and his former wife, Vicky Pryce, for perverting the course of justice contrary to common law.

[13] He presided over and was sentencing judge in high-profile cases involving terrorists and extremists, such as the two men responsible for the murder of Lee Rigby in 2013,[14][15] the man convicted of the murder of MP David Amess[16][17] and White supremacist bomber Pavlo Lapshyn[18] He was also involved in numerous other high profile cases.

He was the presiding judge in the trial of Rolf Harris for various counts of indecent assault dating back to the 1960s.