The Diocese of Reykjavík (Latin: Dioecesis Reykiavikensis) is a Latin Church diocese of the Catholic Church which covers the whole of the country of Iceland, and numbered 14,723 Catholics as of 2022. It is directly subject to the Holy See.

The Apostolic Prefecture of Iceland was created in 1923 and this was elevated to an Apostolic Administration in 1929, which in turn was elevated to the status of a diocese in 1968. In 2015 the then bishop, Pierre Bürcher retired and Father Dávid Bartimej Tencer, OFM Cap., was appointed to succeed him as the fifth bishop of the diocese. The bishop of Reykjavík participates in the Scandinavian Bishops Conference. The vicar general is Fr. Patrick Breen, rector of Landakot Cathedral, Christ the King Parish.

The Diocese of Reykjavík is a modern creation. The medieval church was represented by the sees of Skálholt (created 1056) and Hólar (1106), but these became Lutheran during the Reformation. (These two sees were amalgamated in 1801 into a single diocese under the Bishop of Iceland in the Lutheran Church of Iceland.) Iceland remained without Roman Catholic prelates until the Apostolic Prefecture was established at Reykjavík in 1923.

1. Martin Meulenberg, SMM (12 June 1923 – 3 August 1941)
2. Jóhannes Gunnarsson, SMM (23 February 1942 – 14 October 1967)

1. Hendrik Hubert Frehen, SMM (18 October 1968 – 31 October 1986)
2. Alfred James Jolson, SJ (12 December 1987 – 21 March 1994)
3. Joannes Gijsen (24 May 1996 – 30 October 2007)
4. Pierre Bürcher (30 October 2007 – 18 September 2015)
5. Dávid Bartimej Tencer, OFM Cap. (18 September 2015 – )

• Bishop of Reykjavík (Catholic)
• Christ the King Cathedral, Reykjavík (Iceland)
• Catholic Church in Iceland
• Religion in Iceland
• St. Thorlak Church, Reyðarfjörður

• Roman Catholic Diocese of Reykjavík (in English and Icelandic)
• Statistics relating to the Diocese of Reykjavik
• Statistics relating to Iceland

64°08′51″N 21°56′55″W / 64.1474°N 21.9486°W / 64.1474; -21.9486