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| Augustus the Younger | |
|---|---|
| Duke of Brunswick-Lüneburg | |
 Duke Augustus, 1666 painting | |
| Prince of Brunswick-Wolfenbüttel | |
| Reign | 11 August 1634 – 17 September 1666 |
| Predecessor | Frederick Ulrich |
| Successor | Rudolph Augustus |
| Born | 10 April 1579 Dannenberg, Principality of Lüneburg, Brunswick-Lüneburg |
| Died | 17 September 1666 (aged 87) Wolfenbüttel, Principality of Brunswick-Wolfenbüttel, Brunswick-Lüneburg |
| Spouse | Clara Maria of Pomerania-Barth Dorothea of Anhalt-Zerbst Elisabeth Sophie of Mecklenburg |
| Issue | Henry August Rudolph August Sibylle Ursula Klara Auguste Anton Ulrich Ferdinand Albert I Marie Elisabeth |
| House | House of Welf |
| Father | Henry, Duke of Brunswick-Lüneburg |
| Mother | Ursula of Saxe-Lauenburg |
Augustus II (10 April 1579 – 17 September 1666), called the Younger (German: August der Jüngere), a member of the House of Welf was Duke of Brunswick-Lüneburg. In the estate division of the House of Welf of 1635, he received the Principality of Wolfenbüttel which he ruled until his death. Considered one of the most literate princes of his time, he is known for founding the Herzog August Library at his Wolfenbüttel residence, then the largest collection of books and manuscripts north of the Alps.