Sir Samuel Knox Cunningham, 1st Baronet, QC (3 April 1909 – 29 July 1976) was a Northern Irish barrister, businessman and politician.

His father was Samuel Cunningham, and his mother was Janet Muir Knox (née McCosh) of Dalry, Ayrshire.

During the Second World War he served in the Scots Guards although he continued his legal studies, and called to the Bar in Northern Ireland in 1942.

His religious faith led him to be involved with the World Alliance of YMCAs from 1947, and he was Chairman of the National Council of the YMCA in 1949.

[4] Cunningham remained on the backbenches, known as one to the right of Ulster Unionism and a friend of Ian Paisley,[5] through the rest of the 1960s, he frequently clashed with Harold Wilson during this period, but decided to retire at the 1970 general election.

Military intelligence, the RUC and victims named Cunningham as a paedophile and identified his close links to the sex offender ring at Kincora Boys' Home but MI5 deny this.