Sir Ivan Roy Callan KCVO CMG (born 1942) is a retired British diplomat.
Educated at University College, Oxford, Callan joined the Foreign and Commonwealth Office (FCO) in 1969[1] and was appointed to HM Diplomatic Service in 1972.
After returning to the FCO, he was appointed High Commissioner of Brunei (1994–98) and then Ambassador to Oman, serving from 1999 until retirement in 2002.
[1] Callan was appointed a Companion of the Order of St Michael and St George in the 1990 Birthday Honours.
[3] He was also appointed a Knight Commander of the Royal Victorian Order in September 1998.