Back فريدرش الثالث (ناخب بالاتينات) Arabic III Fridrix (Pfals kürfürstü) Azerbaijani Фридрих III (Пфалц) Bulgarian Frederik 3., kurfyrste af Pfalz Danish Friedrich III. (Pfalz) German Φρειδερίκος Γ΄ του Παλατινάτου Greek Federico III del Palatinado Spanish Friedrich III (Pfalz) Estonian Frederiko III.a Palatinatukoa Basque Frédéric III du Palatinat French
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| Frederick III | |
|---|---|
 Frederick III, Elector Palatine | |
| Elector Palatine | |
| Reign | 12 February 1559 – 26 October 1576 |
| Predecessor | Otto Henry |
| Successor | Louis VI |
| Born | 14 February 1515 Simmern |
| Died | 26 October 1576 (aged 61) Heidelberg |
| Burial | Heiliggeistkirche, Heidelberg |
| Spouse | Marie of Brandenburg-Kulmbach Amalia of Neuenahr |
| Issue | Alberta Louis VI, Elector Palatine Elizabeth, Duchess of Saxony Hermann Louis Johann Casimir of Simmern Dorothea Susanne, Duchess of Saxe-Weimar Albert Anne Elizabeth Christopher Charles Cunigunde, Countess of Nassau-Dillenburg |
| House | House of Wittelsbach |
| Father | John II of Simmern |
| Mother | Beatrice of Baden |
| Religion | Reformed |
Frederick III of Simmern, the Pious, Elector Palatine of the Rhine (14 February 1515 – 16 October 1576) was a ruler from the house of Wittelsbach, branch Palatinate-Simmern-Sponheim. He was a son of John II of Simmern and inherited the Palatinate from the childless Elector Otto-Henry, Elector Palatine (Ottheinrich) in 1559. He was a devout convert to Calvinism, and made the Reformed confession the official religion of his domain by overseeing the composition and promulgation of the Heidelberg Catechism. His support of Calvinism gave the German Reformed movement a foothold within the Holy Roman Empire.