 | 1909 | 1910 | 1911 |  |
Date | Country | Change |
| 1910 |  Algeria | Titular Episcopal See of Tipasa was established |
| 1910.01.03 |  Brazil | Diocese of Aracaju was established (from Metropolitan Archdiocese of São Salvador da Bahia and became suffragan of São Salvador da Bahia) |
| 1910.01.21 |  Argentina | Diocese of Catamarca was established (from Diocese of Salta and Diocese of Tucumán and became suffragan of Buenos Aires) |
| 1910.01.21 | Argentina | Diocese of Corrientes was established (from Diocese of Paraná and became suffragan of Buenos Aires) |
| 1910.02.14 |  China | Apostolic Vicariate of Central Chi-Li 直隸中境 was established (from Apostolic Vicariate of Northern Chi-Li 直隸北境) |
| 1910.02.24 |  Iraq | Diocese of Aqrā (Chaldean Rite) was restored (from Diocese of Amadiyah and became suffragan of Babylon) |
| 1910.03.04 |  Canada | Apostolic Vicariate of Keewatin was established (from Diocese of Prince Albert and became suffragan of Saint-Boniface) |
| 1910.03.04 | Canada | Diocese of Regina was established (from Metropolitan Archdiocese of Saint-Boniface and became suffragan of Saint-Boniface) |
| 1910.03.10 | Brazil | Diocese of Corumbá was established (from Diocese of Cuiabá and became suffragan of Cuiabá) |
| 1910.03.10 | Brazil | Diocese of Cuiabá was promoted as Metropolitan Archdiocese of Cuiabá (with suffragan see Corumbá and lost territory to establish Diocese of Corumbá) |
| 1910.04.05 | Brazil | Diocese of São Luiz de Cáceres was established (from Metropolitan Archdiocese of Cuiabá and became suffragan of Cuiabá) |
| 1910.04.10 |  Philippines | Diocese of Calbayog was established (from Diocese of Cebu and became suffragan of Manila) |
| 1910.04.10 | Philippines | Diocese of Lipa was established (from Metropolitan Archdiocese of Manila and Diocese of Nueva Caceres and became suffragan of Manila) |
| 1910.04.10 | Philippines | Apostolic Prefecture of Palawan was established (from Diocese of Jaro) |
| 1910.04.10 | Philippines | Diocese of Tuguegarao was established (from Diocese of Nueva Segovia and became suffragan of Manila) |
| 1910.04.10 | Philippines | Diocese of Zamboanga was established (from Diocese of Cebu and Diocese of Jaro and became suffragan of Manila) |
| 1910.04.15 |  USA | Diocese of Toledo was established (from Diocese of Cleveland and became suffragan of Cincinnati) |
| 1910.05.03 |  Chile,  Antarctica | Military Vicariate of Chile was established |
| 1910.05.04 |  Australia | Mission sui juris of Drisdale River was established (from Apostolic Vicariate of Kimberley in Western Australia and became suffragan of Melbourne) |
| 1910.05.10 | China | Apostolic Vicariate of Chekiang 浙江 was renamed as Apostolic Vicariate of Eastern Chekiang 浙江東境 (lost territory to establish Apostolic Vicariate of Western Chekiang 浙江西境) |
| 1910.05.10 | China | Apostolic Vicariate of Western Chekiang 浙江西境 was established (from Apostolic Vicariate of Chekiang 浙江) |
| 1910.05.23 | Brazil | Apostolic Prefecture of Alto Solimões was established (from Diocese of Amazonas) |
| 1910.05.23 | Brazil | Apostolic Prefecture of Tefé was established (from Diocese of Amazonas) |
| 1910.06.08 | USA | Abbacy nullius of Belmont–Mary Help of Christians was established (from Apostolic Vicariate of North Carolina and became suffragan of Baltimore) |
| 1910.06.14 | Chile | Mission sui juris of Valdivia was established (from Diocese of San Carlos de Ancud) |
| 1910.06.16 |  Sudan | Apostolic Vicariate of Central Africa lost territory to Apostolic Prefecture of Uélé |
| 1910.07.07 |  Colombia | Diocese of Cali was established (from Metropolitan Archdiocese of Popayán and became suffragan of Popayán) |
| 1910.08.05 |  Congo-Kinshasa | Apostolic Prefecture of Katanga was established (from Apostolic Vicariate of Tanganyika) |
| 1910.08.05 |  Italy | Abbacy nullius of San Michele Arcangelo di Montescaglioso was suppressed (to Metropolitan Archdiocese of Acerenza and united to Metropolitan Archdiocese of Acerenza) |
| 1910.08.06 | USA | Diocese of Alexandria was established (from the suppressed Diocese of Natchitoches and became suffragan of New Orleans) |
| 1910.08.06 | USA | Diocese of Natchitoches was suppressed (to establish Diocese of Alexandria) |
| 1910.08.12 | China | Apostolic Vicariate of Jianchang 建昌 was established (from Apostolic Vicariate of Southern Szechwan 四川南境) |
| 1910.08.15 | Brazil | Diocese of Pelotas was established (from Diocese of São Pedro do Rio Grande and became suffragan of Porto Alegre) |
| 1910.08.15 | Brazil | Diocese of São Pedro do Rio Grande was promoted as Metropolitan Archdiocese of Porto Alegre (with suffragan sees Pelotas, Santa Catarina, Santa Maria and Uruguaiana and lost territory to establish Diocese of Pelotas, Diocese of Santa Maria and Diocese of Uruguaiana) |
| 1910.08.15 | Brazil | Diocese of Santa Maria was established (from Diocese of São Pedro do Rio Grande and became suffragan of Porto Alegre) |
| 1910.08.15 | Brazil | Diocese of Uruguaiana was established (from Diocese of São Pedro do Rio Grande and became suffragan of Porto Alegre) |
| 1910.09.11 |  Iran | Diocese of Isfahan was promoted as Archdiocese of Isfahan |
| 1910.09.13 |  India | Archdiocese of Simla was established (from Metropolitan Archdiocese of Agra and Diocese of Lahore) |
| 1910.09.13 |  Tanzania | Apostolic Vicariate of Kilima-Njaro was established (from Apostolic Vicariate of Bagamoyo) |
| 1910.10.19 | Brazil | Apostolic Prefecture of Rio Negro was established (from Diocese of Amazonas) |
| 1910.11.10 |  Gibraltar | Apostolic Vicariate of Gibraltar was promoted as Diocese of Gibraltar (without ecclesiastical province) |
| 1910.11.15 | Canada | Diocese of Alexandria in America was renamed as Diocese of Alexandria in Ontario |
| 1910.12.05 | Brazil | Diocese of Floresta was established (from Diocese of Olinda and became suffragan of Olinda) |
| 1910.12.05 | Brazil | Diocese of Olinda was promoted as Metropolitan Archdiocese of Olinda (with suffragan sees Ceará, Floresta, Natal and Paraíba and lost territory to establish Diocese of Floresta) |
| 1910.12.10 | Brazil | Diocese of Montes Claros was established (from Diocese of Diamantina and became suffragan of Mariana) |
| 1910.12.22 |  South Africa | Apostolic Prefecture of Northern Transvaal was established (from Apostolic Vicariate of Transvaal) |
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