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.

[6] Shortly after assuming the regency, Duke John Albert would walk Brunswick in civilian clothes visiting museums, libraries and other institutions in the duchy, asking questions of people to discover their living conditions.

[7] The regency came to an end on 1 November 1913 when Ernest Augustus, Crown Prince of Hanover's son Ernest Augustus was permitted to ascend to Duchy following his marriage to Princess Victoria Louise of Prussia the only daughter of the German Emperor William II which helped heal the rift between the houses of Hanover and Hohenzollern.

John Albert was married twice: firstly in Weimar on 6 November 1886 to Princess Elisabeth Sybille of Saxe-Weimar-Eisenach (28 February 1854–10 July 1908) the daughter of Charles Alexander, Grand Duke of Saxe-Weimar-Eisenach;[11] secondly in Brunswick on 15 December 1909 to Princess Elisabeth of Stolberg-Rossla (1885–1969), who following his death was to marry his half brother Duke Adolf Friedrich in 1924.

[1] Ojimukoka, a small settlement, postoffice and railway station in Namibia, was renamed Johann - Albrechtshöhe, and then simply Albrechts in his honour.