The Diocese of Stockholm (Latin: Dioecesis Holmiensis; Swedish: Stockholms katolska stift) 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.

In 1582, any remaining Catholics in Sweden and elsewhere in Northern Europe were placed under the jurisdiction of a papal nuncio in Cologne.

The newly Vicariate of Sweden was entitled to a titular bishop, but the positions appears to have been left vacant until 1862.

On 29 June 1953 the Apostolic Vicariate of Sweden was promoted to Diocese Stockholm, named after its see, while the same diocesan status was given in Norway to the new bishopric of Oslo.