| Sidonie of Saxony | |
|---|---|
| Duchess of Brunswick-Lüneburg Princess of Calenberg-Göttingen | |
 Oil painting by Lucas Cranach the Elder | |
| Tenure | 1545–1573 |
| Born | 8 March 1518 Meissen |
| Died | 4 January 1575 (aged 56) Weißenfels |
| Burial | |
| Spouse | Eric II, Duke of Brunswick-Lüneburg |
| House | Wettin |
| Father | Henry IV, Duke of Saxony |
| Mother | Catherine of Mecklenburg |
Sidonie of Saxony (also: Sidonia; 8 March 1518, Meissen – 4 January 1575, Weißenfels) was a princess of the House of Wettin and by marriage Duchess of Brunswick-Lüneburg and Princess of Calenberg-Göttingen.