Roger Hollis (1905-1973) was Director of the British Security Service (MI5) 1956-1965.
He was the first senior officer to suspect the role of Sir Anthony Blunt.
Several books, either by journalists or retired MI5 officers, suspected him of being a Soviet double agent. These included the 1981 Their Trade is Treachery by Chapman Pincher and Peter Wright 1987 Spycatcher. Suspicion came when Anatoly Golitsyn, a KGB defector to the U.S. Central Intelligence Agency, claimed, in 1961, that the Russians had penetrated MI5.
- Peter Wright (1987), Spycatcher, R.R. Donnelly
- Michael Evans (24 October 2009), "Documents show that former MI5 chief Sir Roger Hollis was not a traitor", Times (UK)