The Diocese of Stockholm is an exempt Latin Catholic ecclesiastical bishopric in Sweden and the only Catholic diocese established in Sweden since the Protestant Reformation. The diocese belongs to no ecclesiastical province but forms an episcopal conference with its Nordic neighbours. Its territory includes 44 parishes and covers the entire country of Sweden.

Saint Eric's Cathedral is a Catholic cathedral in Stockholm, Sweden. It is located on Södermalm, the southern part of central Stockholm. It was built in 1892 and was raised to the status of a cathedral in 1953, when the Catholic Diocese of Stockholm was created. The substantial increase in the number of Catholics in Stockholm and Sweden, mostly as a result of immigration after World War II, made the old church insufficient, and an extension, designed by architects Hans Westman and Ylva Lenormand, was inaugurated in 1983, at the 200th anniversary of the re-establishment in 1783 of the Catholic Church in Lutheran Sweden. The block where the cathedral is located also contains other functions serving the Catholic Church in Sweden.