| Date
| Event
| From
| To
|
|---|
| Vicariate Apostolic of Siam
|
| 1662
| Erected
| | Vicariate Apostolic of Siam (erected)
|
| Vicariate Apostolic of Eastern Siam {Siam Orientale}
|
| 10 September
1841
| Name Changed
| Vicariate Apostolic of Siam
| Vicariate Apostolic of Eastern Siam {Siam Orientale}
|
| 4 May
1899
| Territory Lost
| Vicariate Apostolic of Eastern Siam {Siam Orientale}
| Vicariate Apostolic of
Laos
(erected)
|
| Vicariate Apostolic of Bangkok
|
| 3 December
1924
| Name Changed
| Vicariate Apostolic of Eastern Siam {Siam Orientale}
| Vicariate Apostolic of Bangkok
|
| 30 June
1930
| Territory Lost
| Vicariate Apostolic of Bangkok (Bajauri, Surat, and Srithamarat)
Diocese of
Malacca
(Patani and Phuket)
| Mission "Sui Iuris" of
Rajaburi
(erected)
|
| 11 May
1944
| Territory Lost
| Vicariate Apostolic of Bangkok (Trat, Chanthaburi, Rayong, Chonburi, Chachoengsao, Nakhon Nayok, and parts of Chachoengsao and Nakhon Nayok)
| Vicariate Apostolic of
Chantaburi
(erected)
|
| 17 November
1959
| Territory Lost
| Vicariate Apostolic of Bangkok (Mehongson, Chiengmai, Chiengrai, Lunphun, Lampang, Nan, Phre, and Uttaradit)
| Prefecture Apostolic of
Chieng-Mai
(erected)
|
| Archdiocese of Bangkok
|
| 18 December
1965
| Elevated
| Vicariate Apostolic of Bangkok
| Archdiocese of Bangkok
|
| 9 February
1967
| Territory Lost
| Archdiocese of Bangkok (Tak, Sukkotai, Phitsanulok, Kamphenghet, Pichit, Pechabum, Nakhorn-Sawan, Uthaithani, Chainat, Singbury, Lopbury, and Sarabury)
| Diocese of
Nakhorn-Sawan
(erected)
|