 | 1804 | 1805 | 1806 |  |
Date | Country | Change |
| 1805 |  Italy | Abbacy nullius of Santa Maria ad Abbadia Alpina was suppressed (to Diocese of Saluzzo) |
| 1805.02.01 |  Germany | Diocese of Worms was suppressed |
| 1805.06.13 |  Poland | Diocese of Kielce was established (from Metropolitan Archdiocese of Gniezno, Diocese of Chełm–Lublin and Diocese of Kraków and became suffragan of Gniezno) |
| 1805.06.13 | Poland | Diocese of Kraków lost territory to Diocese of Chełm–Lublin |
| 1805.06.13 | Poland | Diocese of Warszawa lost territory to Diocese of Chełm–Lublin |
| 1805.09.22 | Poland | Diocese of Chełm–Lublin was suppressed (to establish Diocese of Lublin) |
| 1805.09.22 | Poland | Diocese of Lublin was established (from the suppressed Diocese of Chełm–Lublin and became suffragan of Gniezno) |
| 1805.09.24 | Poland | Diocese of Tarnów was suppressed (to Diocese of Kraków and Diocese of Przemyśl) |
| 1805.12.20 | Italy | Diocese of Gallese was restored (from Diocese of Civita Castellana) |
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