| Heinrich IV | |
| Prince Reuss | |
| Succession: | Head of House of Reuss |
| Reign: | 1945/1962 - 2012 |
| Reign-Type: | Period |
| Predecessor: | Prince (Fürst) Heinrich XLV |
| Successor: | Prince (Fürst) Heinrich XIV |
| Suc-Type: | Successor |
| Birth Date: | 26 October 1919 |
| Birth Place: | Ernstbrunn, Austria |
| Death Place: | Ernstbrunn, Austria |
| Burial Place: | Ernstbrunn, Austria |
| Father: | Prince Heinrich XXXIX Reuss |
| Mother: | Countess Antonia of Castell-Castell |
| Spouse: | Princess Marie Luise of Salm-Horstmar (1918-2015) |
| Royal Name: | Prince Heinrich IV |
| Dipstyle: | His Serene Highness |
| Offstyle: | Your Serene Highness |
Heinrich IV, Prince Reuss (26 October 1919 – 20 June 2012)[1] was the head of the German formerly princely House of Reuss.[2]
He was born in Ernstbrunn, Austria, the son of Prince Heinrich XXXIX Reuss and Countess Antonia of Castell-Castell. Heinrich IV became head of the princely family after the previous Prince Heinrich XLV went missing in 1945 and was declared dead in 1962. He lived with his family at Castle Ernstbrunn in Lower Austria. His son, Prince Heinrich XIV also bought a piece of expropriated property in Eastern Germany.
On 10 June 1954 the prince married Princess Marie Luise of Salm-Horstmar (1918-2015), daughter of Otto, Prince of Salm-Horstmar and Countess Rosa of Solms-Baruth. They had one son and three daughters: