 | 1827 | 1828 | 1829 |  |
Date | Country | Change |
| 1828.04.22 |  Lithuania | Diocese of Vilnius (Ukrainian Rite) was suppressed (to establish Diocese of Žyrovyci) |
| 1828.04.22 | Lithuania | Diocese of Žyrovyci (Ukrainian Rite) was established (from the suppressed Diocese of Vilnius and Diocese of Volodymyr–Brėst) |
| 1828.04.22 |  Ukraine,  Belarus | Diocese of Volodymyr–Brėst (Ukrainian Rite) was suppressed (to establish Diocese of Žyrovyci) |
| 1828.06.30 |  Croatia | Diocese of Arba was suppressed (to Diocese of Krk) |
| 1828.06.30 | Croatia | Metropolitan Archdiocese of Ragusa was demoted as Diocese of Dubrovnik (gained territory from the suppressed Diocese of Korcula and Diocese of Ston and became suffragan of Zadar) |
| 1828.06.30 | Croatia | Diocese of Knin was suppressed (to Diocese of Šibenik) |
| 1828.06.30 | Croatia | Diocese of Korcula was suppressed (to Diocese of Dubrovnik) |
| 1828.06.30 | Croatia | Diocese of Nona was suppressed (to Metropolitan Archdiocese of Zadar) |
| 1828.06.30 | Croatia | Diocese of Osor was suppressed (to Diocese of Krk) |
| 1828.06.30 | Croatia | Diocese of Poreč was renamed as Diocese of Poreč i Pula (gained territory from the suppressed Diocese of Pula) |
| 1828.06.30 | Croatia | Diocese of Pula was suppressed (to Diocese of Poreč i Pula) |
| 1828.06.30 | Croatia | Diocese of Skradin was suppressed (to Diocese of Šibenik) |
| 1828.06.30 | Croatia | Metropolitan Archdiocese of Split was demoted as Diocese of Split (gained territory from the suppressed Diocese of Traù, lost territory to Diocese of Šibenik and became suffragan of Zadar) |
| 1828.06.30 | Croatia | Diocese of Ston was suppressed (to Diocese of Dubrovnik) |
| 1828.06.30 | Croatia | Diocese of Traù was suppressed (to Diocese of Šibenik and Diocese of Split) |
| 1828.06.30 |  Montenegro | Diocese of Budua was suppressed (to Diocese of Kotor) |
| 1828.09.13 |  Italy | Abbacy nullius of San Pietro Apostolo di Guastalla was promoted as Diocese of Guastalla (gained territory from Diocese of Parma and without ecclesiastical province) |
| 1828.09.13 | Italy | Diocese of Parma lost territory to Diocese of Guastalla and Diocese of Reggio Emilia |
| 1828.12.15 |  Argentina | Apostolic Vicariate of San Juan de Cuyo was established (from Diocese of Córdoba) |
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