| Consort: | yes |
| Johanna Magdalene of Saxe-Weissenfels | |
| Succession: | Duchess consort of Courland |
| Reign: | 1730-1737 |
| Spouse: | Ferdinand Kettler |
| House: | House of Wettin |
| Father: | Johann Georg, Duke of Saxe-Weissenfels |
| Mother: | Fredericka Elisabeth of Saxe-Eisenach |
| Birth Date: | 17 March 1708 |
| Death Date: | 25 January 1760 |
Johanna Magdalene of Saxe-Weissenfels (17 March 1708 – 25 January 1760), was a Duchess consort of Courland and by marriage member of the House of Kettler. By birth she was member of the Saxe-Weissenfels line of the House of Wettin.
She was the born as only surviving daughter of Johann Georg, Duke of Saxe-Weissenfels and his wife, Princess Fredericka Elisabeth of Saxe-Eisenach.[1]
On 20 September 1730, in Danzig, she married Ferdinand Kettler, the Duke of Courland, who was 75 years old at the time. The marriage remained childless.[2]