Landakotskirkja, officially named Basilika Krists konungs and often referred to as Kristskirkja, is a basilica located in the western part of the Icelandic capital of Reykjavík and is the cathedral of the Roman Catholic Diocese of Reykjavík. It is the sole Catholic cathedral in Iceland.

The Diocese of Reykjavík 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.