| Frederick IV, Duke of Brunswick-Lüneburg | |
| House: | House of Welf |
| Father: | William, Duke of Brunswick-Lüneburg |
| Mother: | Dorothea of Denmark |
Frederick, Duke of Brunswick and Lüneburg, (28 August 1574 – 10 December 1648) was the Prince of Lüneburg from 1636 to 1648.
Frederick was born on 28 August 1574, the tenth child of William the Younger (Brunswick-Lüneburg) (1535–1592) and Dorothea of Denmark to the New House of Lüneburg.
He became bishop's adjutor in the Bishopric of Ratzeburg and was elected propst (provost) of the Archdiocese of Bremen.
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