Back Магнус I (Саксония-Лауенбург) Bulgarian Magnus 1. af Sachsen-Lauenburg Danish Magnus I. (Sachsen-Lauenburg) German Μάγκνους Α΄ της Σαξονίας-Λάουενμπουργκ Greek Magnus I de Sajonia-Lauenburgo Spanish Magnus Ier de Saxe-Lauenbourg French Magnus I di Sassonia-Lauenburg Italian マグヌス1世 (ザクセン＝ラウエンブルク公) Japanese Magnus I van Saksen-Lauenburg Dutch Magnus I av Sachsen-Lauenburg NB
| Magnus I | |
|---|---|
| Duke of Saxe-Lauenburg | |
 Magnus I (ca. 1520) | |
| Duke of Saxe-Lauenburg | |
| Reign | 1507–1543 |
| Predecessor | John V, Duke of Saxe-Lauenburg |
| Successor | Francis I, Duke of Saxe-Lauenburg |
| Born | 1 January 1470 Ratzeburg |
| Died | 1 August 1543 (aged 73) Ratzeburg |
| Burial | Ratzeburg |
| Spouse | Catherine of Brunswick-Wolfenbüttel |
| Issue Detail | Francis I Dorothea, Queen of Denmark Catherine, Queen of Sweden Clara, Duchess of Brunswick-Giffhorn Sophia, Countess of Oldenburg-Delmenhorst Ursula, Duchess of Mecklenburg-Schwerin |
| House | Ascania |
| Father | John V, Duke of Saxe-Lauenburg |
| Mother | Dorothea of Brandenburg |
| Religion | Roman Catholic until 1531, thereafter Lutheran |
Magnus I of Saxe-Lauenburg (1 January 1470 – 1 August 1543) was a Duke of Saxe-Lauenburg from the House of Ascania.