| Date | Event | From | To |
|---|
| Prefecture Apostolic of Thakhek |
| 21 December 1950 | Erected | Vicariate Apostolic of Laos (Gammon, Savannakhet, Saravane, and Bassac)
| Prefecture Apostolic of Thakhek (erected)
|
| 4 April 1957 | Territory Added | Vicariate Apostolic of Kontum (Attopeu)
| Prefecture Apostolic of Thakhek
|
| Vicariate Apostolic of Thakhek |
| 24 February 1958 | Elevated | Prefecture Apostolic of Thakhek
| Vicariate Apostolic of Thakhek
|
| Vicariate Apostolic of Savannakhet |
| 26 November 1963 | Name Changed | Vicariate Apostolic of Thakhek
| Vicariate Apostolic of Savannakhet
|
| 12 June 1967 | Territory Lost | Vicariate Apostolic of Savannakhet (Saravane, Vapikhamthong, Sédon, Champassac, Attopeu, and Sithandone)
| Vicariate Apostolic of Paksé (erected)
|