| Johann II | |
| Succession: | Duke of Saxe-Weimar and Jena |
| Reign: | 7 July 1602 - 18 July 1605 |
| Predecessor: | Frederick Wilhelm I |
| Birth Date: | 22 May 1570 |
| Birth Place: | Weimar, Electorate of Saxony, Holy Roman Empire |
| Death Place: | Weimar, Saxe-Weimar, Holy Roman Empire |
| Spouse: | Dorothea Maria of Anhalt |
| Issue-Link: |
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| Issue-Pipe: | among others... |
| Full Name: | Johann Maria Wilhelm |
| House: | House of Wettin |
| Father: | Johann Wilhelm, Duke of Saxe-Weimar |
| Mother: | Dorothea Susanne of Simmern |
| Succession1: | Ruler of Saxe-Altenburg |
| Predecessor1: | Frederick Wilhelm I |
Johann II, Duke of Saxe-Weimar (Johann Maria Wilhelm; 22 May 1570 – 18 July 1605) was a Duke of Saxe-Weimar and Jena.
Johann was the second son of Johann Wilhelm, Duke of Saxe-Weimar and Dorothea Susanne of Simmern.
Johann Wilhelm died in 1573 when his son was only three years old. Since at the time Johann's older brother Frederick William I was also under age, the duchy of Saxe-Weimar (originally awarded to Johann) was governed by a regency. In 1586 Frederick William reached adulthood and took full control of the duchy, including Weimar. However, he died in 1602 and the full duchy was inherited by Johann, because Frederick William's sons were underage.
Johann was more interested in natural sciences and art than politics, and therefore only against his will took over the regency of the duchy on behalf of his nephews. But when they demanded their own inheritance in 1603, he resisted their demands. Finally, Johann and his nephews made a treaty dividing the duchy: Altenburg was taken by the sons of Frederick William I, and Weimar-Jena was retained by Johann.
This line of Saxe-Altenburg became extinct in 1672, and all the inheritance passed to the line of Saxe-Weimar, Johann's descendants.
In Altenburg on 7 January 1593, Johann married Dorothea Maria of Anhalt (2 July 1574 - 18 July 1617).[1] They had twelve children in just twelve years:
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