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| Friedrich Wilhelm III | |
|---|---|
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| Duke of Saxe-Altenburg | |
| Reign | 1669–1672 |
| Predecessor | Friedrich Wilhelm II |
| Successor | Ernst I |
| Born | 12 July 1657 Altenburg |
| Died | 14 April 1672 (aged 14) Altenburg |
| House | House of Saxe-Altenburg |
| Father | Friedrich Wilhelm II, Duke of Saxe-Altenburg |
| Mother | Magdalene Sibylle of Saxony |
| Religion | Lutheran |
Friedrich Wilhelm III (12 July 1657 – 14 April 1672) was a duke of Saxe-Altenburg.
He was the second son of Friedrich Wilhelm II, Duke of Saxe-Altenburg and Magdalene Sybille of Saxony, his second wife.