Back جون البرت الاول دوق مكلنبورج ARZ Йохан Албрехт I (Мекленбург) Bulgarian Joan Albert I de Mecklenburg-Schwerin Catalan Jan Albrecht I. Meklenburský Czech Johan Albrecht 1. af Mecklenburg Danish Johann Albrecht I. (Mecklenburg) German Ιωάννης Αλβέρτος Α΄ του Μεκλεμβούργου Greek Johano Alberto la 1-a (Meklenburgo) Esperanto Juan Alberto I de Mecklemburgo Spanish Johann Albrecht I Estonian
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (April 2017) |
| John Albert I | |
|---|---|
 | |
| Duke of Mecklenburg-Schwerin | |
| Reign | 6 February 1552 - 12 February 1576 |
| Predecessor | Henry V |
| Successor | John VII |
| Co-Ruler | Philip (1552-1557) |
| Duke of Mecklenburg-Güstrow | |
| Reign | 7 January 1547 - 17 February 1555 |
| Predecessor | Albrecht VII |
| Successor | Ulrich III |
| Born | 23 December 1525 Güstrow |
| Died | 12 February 1576 (aged 50) Schwerin |
| Spouse | Anna Sophia of Prussia |
| Issue | John VII, Duke of Mecklenburg-Schwerin |
| House | House of Mecklenburg |
| Father | Albrecht VII, Duke of Mecklenburg |
| Mother | Anne of Brandenburg |
John Albert I, in older literature known as John or Johann (23 December 1525 – 12 February 1576), was the reigning duke of Mecklenburg-Güstrow from 1547 to 1556 and of Mecklenburg-Schwerin from 1556 to 1576. In 1549 John Albert I saw to it that the parliament of Mecklenburg carried through the Reformation for the entire duchy.