Back Frederico Guillén IV de Prusia AN فريدرش فيلهلم الرابع Arabic فريدرش فيلهلم الرابع ملك بروسيا ARZ IV Fridrix Vilhelm AZ دؤردونجو فریدریش ویلهلم AZB Фрыдрых Вільгельм IV BE Фридрих Вилхелм IV Bulgarian Frederig Gwilherm IV Prusia BR Frederic Guillem IV de Prússia Catalan Fridrich Vilém IV. Czech
| Frederick William IV | |
|---|---|
| King of Prussia | |
 | |
| Reign | 4 June 1840 – 2 January 1861 |
| Predecessor | Frederick William III |
| Successor | William I |
| Born | 15 October 1795 Berlin, Prussia |
| Died | 2 January 1861 (age 65) Potsdam |
| Burial | Charlottenburg Palace, Berlin |
| Spouse | Elisabeth Ludovika of Bavaria |
| House | House of Hohenzollern |
| Father | Frederick William III |
| Mother | Louise of Mecklenburg-Strelitz |
| Religion | Calvinism |
King Frederick William IV of Prussia (German: Friedrich Wilhelm IV. von Preußen) (15 October 1795 – 2 January 1861) was the eldest son and successor of Frederick William III of Prussia. He reigned as King of Prussia from 1840 to 1861.