 | 1912 | 1913 | 1914 |  |
Date | Country | Change |
| 1913 |  Algeria | Titular Episcopal See of Auzia was suppressed |
| 1913 | Algeria | Titular Episcopal See of Tipasa was renamed as Titular Episcopal See of Tipasa |
| 1913 |  Germany | Diocese of Eichstätt lost territory to Metropolitan Archdiocese of Bamberg |
| 1913 |  Libya | Titular Archiepiscopal See of Ptolemais antea Syis was demoted as Titular Episcopal See of Ptolemais |
| 1913 |  Turkiye | Titular Episcopal See of Sebaste was renamed as Titular Episcopal See of Sebaste |
| 1913 | Titular Episcopal See of Antigonea was renamed as Titular Episcopal See of Antigonea | |
| 1913.01.28 |  Ethiopia | Apostolic Prefecture of Southern Kaffa was established (from Apostolic Vicariate of Galla) |
| 1913.01.28 |  Zambia | Apostolic Vicariate of Bangweulu was established (from Apostolic Vicariate of Nyassa) |
| 1913.02.11 |  El Salvador | Diocese of San Miguel was established (from Diocese of San Salvador and became suffragan of San Salvador) |
| 1913.02.11 | El Salvador | Diocese of San Salvador was promoted as Metropolitan Archdiocese of San Salvador (with suffragan sees San Miguel and Santa Ana and lost territory to establish Diocese of San Miguel and Diocese of Santa Ana) |
| 1913.02.11 | El Salvador | Diocese of Santa Ana was established (from Diocese of San Salvador and became suffragan of San Salvador) |
| 1913.02.23 | Libya | Apostolic Prefecture of Tripoli was promoted as Apostolic Vicariate of Libya |
| 1913.04.21 |  Canada | Diocese of Mont-Laurier was established (from Metropolitan Archdiocese of Ottawa and became suffragan of Ottawa) |
| 1913.05.10 |  Madagascar | Apostolic Vicariate of Fianarantsoa was established (from Apostolic Vicariate of Central Madagascar) |
| 1913.05.15 | Madagascar | Apostolic Prefecture of Betafó was established (from Apostolic Vicariate of Central Madagascar) |
| 1913.05.20 | Madagascar | Apostolic Vicariate of Northern Madagascar was renamed as Apostolic Vicariate of Diégo-Suarez |
| 1913.05.20 | Madagascar | Apostolic Vicariate of Southern Madagascar was renamed as Apostolic Vicariate of Fort-Dauphin |
| 1913.05.20 | Madagascar | Apostolic Vicariate of Central Madagascar was renamed as Apostolic Vicariate of Tananarive |
| 1913.05.22 |  India | Apostolic Prefecture of Rajputana was promoted as Diocese of Ajmer |
| 1913.05.22 | India | Archdiocese of Simla was promoted as Metropolitan Archdiocese of Simla (with suffragan sees Lahore and Kafiristan e Kashmir) |
| 1913.05.28 |  USA | Ordinariate of United States of America (Ukrainian Rite) was established |
| 1913.05.30 |  South Sudan | Apostolic Prefecture of Bahr el-Ghazal was established (from Apostolic Vicariate of Central Africa) |
| 1913.05.30 |  Sudan | Apostolic Vicariate of Central Africa was renamed as Apostolic Vicariate of Khartoum (lost territory to establish Apostolic Prefecture of Bahr el-Ghazal) |
| 1913.06.01 |  Norway,  Bouvet Island | Apostolic Vicariate of Norway was renamed as Apostolic Vicariate of Norway and Spitzbergen |
| 1913.07.04 |  Peru | Apostolic Prefecture of San Domingo de Urubamba was promoted as Apostolic Vicariate of Urubamba y Madre de Dios |
| 1913.07.19 |  Taiwan | Apostolic Prefecture of Formosa Island 台灣 was established (from Apostolic Vicariate of Amoy 廈門) |
| 1913.07.25 |  Papua New Guinea | Apostolic Prefecture of Kaiser-Wilhelms-Land was renamed as Apostolic Prefecture of Eastern Kaiser-Wilhelms-Land (lost territory to establish Apostolic Prefecture of Western Kaiser-Wilhelms-Land) |
| 1913.07.25 | Papua New Guinea | Apostolic Prefecture of Western Kaiser-Wilhelms-Land was established (from Apostolic Prefecture of Kaiser-Wilhelms-Land) |
| 1913.07.26 |  Mexico | Diocese of Tacámbaro was established (from Metropolitan Archdiocese of Michoacán and Diocese of Zamora and became suffragan of Michoacán) |
| 1913.08.25 |  Brazil | Diocese of Araçuaí was established (from Diocese of Diamantina and became suffragan of Mariana) |
| 1913.08.28 |  Australia,  Christmas Island,  Cocos Islands,  Heard Island and McDonald Islands | Diocese of Perth was promoted as Metropolitan Archdiocese of Perth (with suffragan sees Geraldton, Kimberley in Western Australia and Drisdale River) |
| 1913.09.08 | Ethiopia | Apostolic Prefecture of Southern Kaffa was renamed as Apostolic Prefecture of Kaffa |
| 1913.09.16 |  Indonesia | Apostolic Prefecture of Lesser Sunda Islands was established (from Apostolic Vicariate of Batavia) |
| 1913.10.20 | Brazil | Diocese of Barra was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 1913.10.20 | Brazil | Diocese of Caetité was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 1913.10.20 | Brazil | Diocese of Ilhéus was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 1913.10.25 |  France | Diocese of Lille was established (from Metropolitan Archdiocese of Cambrai and became suffragan of Cambrai) |
| 1913.11.12 |  Tanzania | Apostolic Prefecture of Lindi was established (from Apostolic Vicariate of Dar-es-Salaam) |
| 1913.12.02 |  Nicaragua | Apostolic Vicariate of Bluefields was established (from Diocese of León and became suffragan of Managua) |
| 1913.12.02 | Nicaragua | Diocese of Granada was established (from Diocese of León and became suffragan of Managua) |
| 1913.12.02 | Nicaragua | Metropolitan Archdiocese of Managua was established (from Diocese of León and with suffragan sees Granada, León and Bluefields) |
| 1913.12.17 | USA | Diocese of Spokane was established (from Diocese of Seattle and became suffragan of Oregon City) |
| 1913.12.31 |  Vietnam | Apostolic Prefecture of Lang Són et Cao Bang was established (from Apostolic Vicariate of Northern Tonking) |
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