| Duke John Albert of Mecklenburg | |
|---|---|
 | |
| Born | 8 December 1857 Schwerin, Mecklenburg-Schwerin |
| Died | 20 February 1920 (aged 62) Schloß Wiligrad near Lübstorf, Germany |
| Spouses | Princess Elisabeth Sybille of Saxe-Weimar-Eisenach Princess Elisabeth of Stolberg-Rossla |
| House | House of Mecklenburg-Schwerin |
| Father | Frederick Francis II, Grand Duke of Mecklenburg |
| Mother | Princess Augusta Reuss of Köstritz |
Duke John Albert of Mecklenburg (German: Herzog Johann Albrecht zu Mecklenburg; given names John Albert Ernest Constantine Frederick Henry; 8 December 1857 – 16 February 1920)[1] was a member of the House of Mecklenburg-Schwerin who served as the regent of two states of the German Empire. He was first regent of the Grand Duchy of Mecklenburg-Schwerin from 1897 to 1901 for his nephew Frederick Francis IV, Grand Duke of Mecklenburg, and thereafter regent of the Duchy of Brunswick from 1907 to 1913.