The Diocese of Mannar (Latin: Dioecesis Mannarensis) is a Roman Catholic diocese for north-western Sri Lanka, administered by the Bishop of Mannar, currently Fidelis Fernando.

[1] The Diocese of Mannar was created on 24 January 1981 from parts of the Diocese of Jaffna.

[2] Between 14 January 2016 and 22 November 2017, the position of Bishop remained vacant, the diocese being overseen by Apostolic Administrator and retired Bishop Kingsley Swampillai.

[1]