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Henry IV the Faithful | |
|---|---|
| Duke of Żagań | |
 Henry IV's seal, dated to 1308 | |
| Born | c. 1292 |
| Died | 22 January 1342 |
| Noble family | Silesian Piasts of Głogów |
| Spouse(s) | Matilda of Brandenburg-Salzwedel |
| Issue | Hedwig Henry V of Iron Salome Agnes |
| Father | Henry III, Duke of Głogów |
| Mother | Matilda of Brunswick-Lüneburg |
Henry IV (II) the Faithful (Polish: Henryk IV (II) Wierny) (c. 1292 – 22 January 1342) was a Duke of Żagań and parts of Greater Poland from 1309 until 1317 (with his brothers in all the lands except Głogów in different divisions among them), Duke of Głogów from 1318 until 1321 (with his brother as co-ruler) and sole ruler over Żagań from 1321 until his death.
He was the oldest son of Henry III (I), Duke of Głogów, by his wife Matilda, daughter of Albert I, Duke of Brunswick-Lüneburg. The nickname of "Faithful" (Wierny) only was given to him in the 14th-century chronicles.