Martin Dillon (born 2 June 1949) is an Irish author, journalist, and broadcaster. He has won international acclaim for his investigative reporting and non-fiction works on the Troubles, including his bestselling trilogy, The Shankill Butchers, The Dirty War and God and the Gun, about the Northern Ireland conflict. The historian and scholar, Dr. Conor Cruise O'Brien, described him as "our Virgil to that Inferno". The Irish Times hailed him as "one of the most creative writers of our time".

Martin Dillon was born in the Lower Falls area of West Belfast, Northern Ireland. He grew up with nine siblings in a traditional Catholic household. His mother, Maureen, looked after the children while his father, Gerard, worked as a watch maker and later telephone engineer to support his large family. Dillon attended St Finian's Primary School on the Falls Road.

In 1961, aged twelve, he left Belfast to pursue a religious vocation at Montfort College Seminary in Romsey, Hampshire. The seminary was run by the Montfort Fathers, a French religious Order devoted to the teachings of St. Louis Marie de Montfort. After four years, he abandoned it and returned to Belfast to finish his studies at St Malachy's College and St Patrick's, Barnageeha. He attended Belfast College of Business Studies in 1970.

Martin Dillon began his distinguished career as a newspaper reporter in 1968. He trained with The Irish News, a daily newspaper with a mainly Irish Nationalist readership, and contributed to its weekly publication, The Irish Weekly. He reported on a variety of events including those related to The Troubles in Northern Ireland.

In 1972, he joined the Belfast Telegraph. Mackay, 2017 stated "As an investigative journalist Dillon tried to reveal objectively the truth about the Northern Ireland Conflict. Under his forensic gaze, the cruelties and failings of all sides were exposed, whether they were Loyalist, Republican or British"

Dillon valued his early years in journalism because of the challenges and unique experiences that later found expression in his non-fiction works. In 1973 Dillon published his first non-fiction book, "Political Murder in Northern Ireland"(co-authored with Denis Lehane). The content of the book is based on much of Dillon's own journalistic research and reporting for the Irish News and Belfast Telegraph.^{[citation needed]}

In 1973, Dillon joined BBC Northern Ireland’s Newsroom as a News Assistant. In 1975, he became a Radio Arts producer and later ran the General Programmes Radio Department, which constituted the majority of BBC Radio Ulster's output. In that role, he created the Behind the Headlines and Talkback programmes. Talkback broke the "normal rules of broadcasting", over 31 years ago. In 2016, Talkback celebrated its thirtieth anniversary.

In 1985, while working as a producer of the Behind the Headlines, he persuaded SDLP leader, John Hume, and Provisional Sinn Féin President, Gerry Adams, to debate their political positions live on the programme. During the broadcast, John Hume agreed to meet the Provisional IRA's Army Council. It was a controversial decision by him, but also a defining moment that led to open a dialogue with the Provisionals. The debate proved to be a seminal element in the genesis of the Northern Ireland peace process. Dillon also introduced John Hume to UDA paramilitary leader, John McMichael, credited with running assassination teams in Northern Ireland.