 | 1997 | 1998 | 1999 |  |
Date | Country | Change |
| 1998 |  Jordan,  Israel,  Palestine | Patriarchal Exarchate of Jerusalem (Armenian Rite) was demoted as Territory Dependent on the Patriarch of Amman and Jerusalem |
| 1998.01.17 |  Myanmar | Diocese of Taunggyi was promoted as Metropolitan Archdiocese of Taunggyi (with suffragan sees Kengtung, Loikaw and Taungngu) |
| 1998.01.24 |  Cuba | Diocese of Guantánamo–Baracoa was restored (from Metropolitan Archdiocese of Santiago and became suffragan of Santiago) |
| 1998.01.25 |  Italy | Diocese of Ariano Irpino–Lacedonia exchanged territory with Metropolitan Archdiocese of Benevento |
| 1998.01.25 | Italy | Diocese of Avellino lost territory to Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia and Diocese of Ariano Irpino–Lacedonia |
| 1998.01.25 | Italy | Metropolitan Archdiocese of Benevento lost territory to Diocese of Avellino |
| 1998.01.25 | Italy | Metropolitan Archdiocese of Salerno–Campagna–Acerno lost territory to Diocese of Avellino |
| 1998.01.25 | Italy | Archdiocese of Sant’Angelo dei Lombardi–Conza–Nusco–Bisaccia lost territory to Metropolitan Archdiocese of Potenza–Muro Lucano–Marsico Nuovo and Diocese of Ariano Irpino–Lacedonia |
| 1998.04.03 |  Kenya | Diocese of Kitale was established (from Diocese of Eldoret and became suffragan of Kisumu) |
| 1998.04.15 |  Brazil | Diocese of Itapetininga was established (from Metropolitan Archdiocese of Sorocaba and Diocese of Itapeva and became suffragan of Sorocaba) |
| 1998.04.17 |  Costa Rica | Diocese of Puntarenas was established (from Diocese of San Isidro de El General and Diocese of Tilarán and became suffragan of San José) |
| 1998.05.22 |  India | Diocese of Vasai was established (from Metropolitan Archdiocese of Bombay and became suffragan of Bombay) |
| 1998.05.27 | Brazil | Diocese of Criciúma was established (from Diocese of Tubarão and became suffragan of Florianópolis) |
| 1998.06.27 |  Botswana | Apostolic Vicariate of Francistown was established (from Diocese of Gaborone and became suffragan of Bloemfontein) |
| 1998.06.27 |  Burkina Faso | Diocese of Banfora was established (from Diocese of Bobo-Dioulasso and became suffragan of Ouagadougou) |
| 1998.06.27 | India | Diocese of Bettiah was restored (from Diocese of Muzaffarpur and became suffragan of Ranchi) |
| 1998.06.27 | India | Diocese of Purnea was established (from Diocese of Dumka and became suffragan of Ranchi) |
| 1998.07.15 |  Spain | Diocese of Lleida lost territory to Diocese of Barbastro–Monzón |
| 1998.09.14 |  Canada | Diocese of Gravelbourg was suppressed (to Metropolitan Archdiocese of Regina and Diocese of Saskatoon) |
| 1998.09.14 | Canada | Metropolitan Archdiocese of Regina lost territory to Diocese of Saskatoon |
| 1998.09.14 | Canada | Territorial Abbacy of Saint Peter–Muenster was suppressed (to Diocese of Saskatoon) |
| 1998.11.05 | India | Diocese of Kannur was established (from Diocese of Calicut and became suffragan of Verapoly) |
| 1998.11.23 |  Venezuela | Diocese of Coro was promoted as Metropolitan Archdiocese of Coro (with suffragan see Punto Fijo) |
| 1998.11.25 |  Ukraine | Diocese of Kyïv–Žytomyr was restored (from the suppressed Diocese of Žytomyr and became suffragan of Lviv) |
| 1998.11.25 | Ukraine | Diocese of Žytomyr was suppressed (to establish Diocese of Kyïv–Žytomyr) |
| 1998.11.28 |  Chad | Diocese of Goré was established (from Diocese of Doba and Diocese of Moundou and became suffragan of N’Djaména) |
| 1998.11.28 | Chad | Diocese of Laï was established (from Diocese of Doba and Diocese of Moundou and became suffragan of N’Djaména) |
| 1998.12.05 | Cuba | Diocese of Camagüey was promoted as Metropolitan Archdiocese of Camagüey (with suffragan sees Ciego de Ávila, Cienfuegos and Santa Clara) |
| 1998.12.29 |  Colombia | Territorial Prelature of Alto Sinú was promoted as Diocese of Montelíbano |
| 1998.12.29 | Colombia | Territorial Prelature of Tibú was promoted as Diocese of Tibú |
| 1998.12.30 | Brazil | Diocese of Ourinhos was established (from Metropolitan Archdiocese of Botucatu, Diocese of Assis and Diocese of Itapeva and became suffragan of Botucatu) |
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