| Date | Country | Change |
| 2008.01.15 | Archiepiscopal Exarchate of Lutsk (Ukrainian Rite) was restored (from Metropolitan Archdiocese of Kyiv) | |
| 2008.01.30 | Diocese of Bratislava (Slovak Rite) was established (from Diocese of Prešov and became suffragan of Prešov) | |
| 2008.01.30 | Apostolic Exarchate of Košice (Slovak Rite) was promoted as Diocese of Košice (became suffragan of Prešov) | |
| 2008.01.30 | Diocese of Prešov (Slovak Rite) was promoted as Metropolitanate sui juris of Prešov (with suffragan sees Bratislava and Košice and lost territory to establish Diocese of Bratislava) | |
| 2008.02.14 | Diocese of Banská Bystrica lost territory to Diocese of Rožňava | |
| 2008.02.14 | Metropolitan Archdiocese of Bratislava–Trnava was renamed as Metropolitan Archdiocese of Bratislava (lost territory to Diocese of Banská Bystrica and Diocese of Nitra, lost territory to establish Archdiocese of Trnava and gained suffragan sees Trnava and Žilina) | |
| 2008.02.14 | Diocese of Nitra lost territory to Diocese of Banská Bystrica | |
| 2008.02.14 | Archdiocese of Trnava was restored (from Metropolitan Archdiocese of Bratislava–Trnava and Diocese of Nitra and became suffragan of Bratislava) | |
| 2008.02.14 | Diocese of Žilina was established (from Diocese of Banská Bystrica and Diocese of Nitra and became suffragan of Bratislava) | |
| 2008.02.27 | Diocese of Floriano was established (from Diocese of Oeiras–Floriano and became suffragan of Teresina) | |
| 2008.02.27 | Diocese of Oeiras–Floriano was renamed as Diocese of Oeiras (gained territory from Metropolitan Archdiocese of Teresina and Diocese of São Raimundo Nonato and lost territory to establish Diocese of Floriano) | |
| 2008.02.27 | Diocese of São Raimundo Nonato lost territory to Diocese of Oeiras | |
| 2008.02.27 | Metropolitan Archdiocese of Teresina lost territory to Diocese of Oeiras | |
| 2008.03.11 | Diocese of Fajardo–Humacao was established (from Metropolitan Archdiocese of San Juan de Puerto Rico and Diocese of Caguas and became suffragan of San Juan de Puerto Rico) | |
| 2008.03.29 | Metropolitan Archdiocese of Cambrai was demoted as Archdiocese of Cambrai (became suffragan of Lille) | |
| 2008.03.29 | Diocese of Lille was promoted as Metropolitan Archdiocese of Lille (with suffragan sees Cambrai and Arras) | |
| 2008.04.02 | Territorial Prelature of Huarí was promoted as Diocese of Huarí | |
| 2008.05.23 | Diocese of Kota Kinabalu was promoted as Metropolitan Archdiocese of Kota Kinabalu (with suffragan sees Keningau and Sandakan) | |
| 2008.06.18 | Diocese of Đakovo i Srijem was promoted as Metropolitan Archdiocese of Đakovo–Osijek (with suffragan sees Požega and Srijem and lost territory to establish Diocese of Srijem) | |
| 2008.06.18 | Diocese of Santo Domingo de los Colorados was renamed as Diocese of Santo Domingo | |
| 2008.06.18 | Diocese of Srijem was restored (from Diocese of Đakovo i Srijem and became suffragan of Đakovo–Osijek) | |
| 2008.06.19 | Diocese of Ebolowa–Kribi was renamed as Diocese of Ebolowa (lost territory to establish Diocese of Kribi) | |
| 2008.06.19 | Diocese of Kribi was established (from Diocese of Ebolowa–Kribi and became suffragan of Yaoundé) | |
| 2008.07.02 | Diocese of Montenegro was established (from Metropolitan Archdiocese of Porto Alegre and became suffragan of Porto Alegre) | |
| 2008.07.13 | Diocese of Anse-à-Veau et Miragoâne was established (from Diocese of Les Cayes and became suffragan of Port-au-Prince) | |
| 2008.07.15 | Apostolic Prefecture of Galápagos was promoted as Apostolic Vicariate of Galápagos | |
| 2008.08.14 | Diocese of Kayanga was established (from Diocese of Rulenge and became suffragan of Mwanza) | |
| 2008.08.14 | Diocese of Rulenge was renamed as Diocese of Rulenge–Ngara (lost territory to establish Diocese of Kayanga) | |
| 2008.08.19 | Diocese of Luz lost territory to Diocese of Guaxupé | |
| 2008.10.07 | Diocese of Haarlem was renamed as Diocese of Haarlem–Amsterdam | |
| 2008.11.11 | Diocese of Bathurst lost territory to Diocese of Saint John, New Brunswick | |
| 2008.11.25 | Diocese of Gómez Palacio was established (from Metropolitan Archdiocese of Durango and became suffragan of Durango) | |
| 2008.12.03 | Diocese of Teotihuacan was established (from Diocese of Texcoco and became suffragan of Tlalnepantla) |
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