Brendan Duddy (10 June 1936 – 12 May 2017) was a businessman from Derry, Northern Ireland, who played a key role in the Northern Ireland peace process. A notable Catholic republican, who was a pacifist and firm believer in dialogue, Duddy became known by MI6 as "The Contact." In his book Great Hatred; Little Room – Making Peace in Northern Ireland, Tony Blair's political advisor Jonathan Powell described Duddy as the "key" which led to discussions between republicans and MI6, and ultimately the Northern Ireland peace process.