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| Francis I | |
|---|---|
| Duke of Saxe-Lauenburg | |
| Reign | 1543 – 1571 |
| Predecessor | Magnus I |
| Successor | Magnus II |
| Duke of Saxe-Lauenburg | |
| Reign | 1573 – 1581 |
| Predecessor | Magnus II |
| Successors | Francis II and Maurice (joint rule) |
| Born | 1510 |
| Died | 19 March 1581 Buxtehude |
| Consort | Sibylle of Saxony |
| Issue more... | Magnus II Francis II Henry Maurice Frederick |
| House | House of Ascania |
| Father | Magnus I |
| Mother | Catherine of Brunswick-Wolfenbüttel |
| Religion | Lutheranism |
Francis I of Saxe-Lauenburg (1510 – 19 March 1581, Buxtehude) was the eldest child and only son of Duke Magnus I of Saxe-Lauenburg and Catherine of Brunswick-Wolfenbüttel (1488 – 29 July 1563, Neuhaus), daughter of Duke Henry IV the Elder of Brunswick and Lunenburg (Wolfenbüttel). Francis I succeeded his father in 1543 as duke of Saxe-Lauenburg, but resigned in favour of his major son Magnus II in 1571. Two years later he reascended and was succeeded by Francis II in 1581.