 | 2002 | 2003 | 2004 |  |
Date | Country | Change |
| 2003.01.08 |  Mexico | Diocese of Piedras Negras was established (from Diocese of Saltillo and became suffragan of Monterrey) |
| 2003.01.14 |  Italy | Diocese of Fidenza exchanged territory with Diocese of Parma and Diocese of Piacenza–Bobbio |
| 2003.01.14 | Italy | Diocese of La Spezia–Sarzana–Brugnato lost territory to Diocese of Massa Carrara–Pontremoli |
| 2003.01.14 | Italy | Diocese of Massa Carrara–Pontremoli lost territory to Diocese of Piacenza–Bobbio |
| 2003.01.14 | Italy | Diocese of Parma exchanged territory with Diocese of Fidenza and Diocese of Piacenza–Bobbio |
| 2003.01.14 | Italy | Diocese of Piacenza–Bobbio exchanged territory with Diocese of Fidenza and Diocese of Parma |
| 2003.01.20 |  Brazil | Territorial Prelature of Borba lost territory to Diocese of Humaitá |
| 2003.01.20 |  Slovakia | Military Ordinariate of Vojenský ordinariát Slovenska was established |
| 2003.01.29 |  Indonesia | Diocese of Samarinda was promoted as Metropolitan Archdiocese of Samarinda (with suffragan sees Banjarmasin, Palangkaraya and Tanjung Selor) |
| 2003.03.07 |  Gabon | Apostolic Prefecture of Makokou was established (from Diocese of Oyem) |
| 2003.03.19 | Gabon | Diocese of Port-Gentil was established (from Metropolitan Archdiocese of Libreville and became suffragan of Libreville) |
| 2003.03.21 |  Egypt | Diocese of Guizeh (Coptic Rite) was established (from Diocese of Alexandria and became suffragan of Alexandria) |
| 2003.03.29 |  Bolivia | Apostolic Vicariate of Cuevo was renamed as Apostolic Vicariate of Camiri |
| 2003.03.31 |  Japan | Diocese of Urawa 浦和 was renamed as Diocese of Saitama さいたま |
| 2003.05.06 | Brazil | Territorial Abbacy of Nossa Senhora do Monserrate do Rio de Janeiro was suppressed (to Metropolitan Archdiocese of São Sebastião do Rio de Janeiro) |
| 2003.05.14 |  Colombia | Diocese of Vélez was established (from Diocese of Socorro y San Gil and became suffragan of Bucaramanga) |
| 2003.05.17 |  Kazakhstan | Apostolic Administration of Astana was promoted as Metropolitan Archdiocese of Most Holy Mary in Astana (with suffragan sees Karaganda, Most Holy Trinity in Almaty and Atyrau) |
| 2003.05.17 | Kazakhstan | Apostolic Administration of Almaty was promoted as Diocese of Most Holy Trinity in Almaty (became suffragan of Most Holy Mary in Astana) |
| 2003.06.28 |  Philippines | Diocese of Cubao was established (from Metropolitan Archdiocese of Manila and became suffragan of Manila) |
| 2003.06.28 | Philippines | Diocese of Kalookan was established (from Metropolitan Archdiocese of Manila and became suffragan of Manila) |
| 2003.06.28 | Philippines | Diocese of Pasig was established (from Metropolitan Archdiocese of Manila and Diocese of Antipolo and became suffragan of Manila) |
| 2003.07.01 | Indonesia | Diocese of Palembang was promoted as Metropolitan Archdiocese of Palembang (with suffragan sees Pangkal-Pinang and Tanjungkarang) |
| 2003.07.04 |  Papua New Guinea | Diocese of Kimbe was established (from Metropolitan Archdiocese of Rabaul and became suffragan of Rabaul) |
| 2003.07.08 | Mexico | Diocese of Valle de Chalco was established (from Diocese of Nezahualcóyotl and became suffragan of Tlalnepantla) |
| 2003.07.28 |  Ukraine | Archiepiscopal Exarchate of Odessa–Krym (Ukrainian Rite) was established (from Archiepiscopal Exarchate of Kyiv–Vyshhorod) |
| 2003.08.06 | Colombia | Diocese of Engativá was established (from Metropolitan Archdiocese of Bogotá and became suffragan of Bogotá) |
| 2003.08.06 | Colombia | Diocese of Fontibón was established (from Metropolitan Archdiocese of Bogotá and became suffragan of Bogotá) |
| 2003.08.06 | Colombia | Diocese of Soacha was established (from Metropolitan Archdiocese of Bogotá and became suffragan of Bogotá) |
| 2003.08.28 |  Serbia,  Kosovo | Apostolic Exarchate of Serbia and Montenegro (Croatian Rite) was established (from Diocese of Križevci) |
| 2003.10.30 |  India | Diocese of Dindigul was established (from Metropolitan Archdiocese of Madurai and Diocese of Tiruchirapalli and became suffragan of Madurai) |
| 2003.11.08 | Mexico | Diocese of Puerto Escondido was established (from Metropolitan Archdiocese of Antequera and became suffragan of Antequera) |
| 2003.11.14 |  Cabo Verde | Diocese of Mindelo was established (from Diocese of Santiago de Cabo Verde and without ecclesiastical province) |
| 2003.11.14 |  Madagascar | Diocese of Toliara was promoted as Metropolitan Archdiocese of Toliara (with suffragan see Morombe) |
| 2003.11.22 | Colombia | Metropolitan Archdiocese of Santa Fe de Antioquia lost territory to Diocese of Quibdó |
| 2003.11.22 | Colombia | Diocese of Santa Rosa de Osos lost territory to Metropolitan Archdiocese of Santa Fe de Antioquia |
| 2003.11.25 |  Ethiopia | Diocese of Emdeber (Ethiopic Rite) was established (from Metropolitanate sui juris of Addis Abeba and became suffragan of Addis Abeba) |
| 2003.12.12 |  Nigeria | Apostolic Vicariate of Bauchi was promoted as Diocese of Bauchi (became suffragan of Jos) |
| 2003.12.19 | Indonesia | Diocese of Timika was established (from Diocese of Jayapura and became suffragan of Merauke) |
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