| Heinrich XXIV | |
|---|---|
 Prince Heinrich XXIV ca. 1905 | |
| Prince Reuss of Greiz | |
| Reign | 19 April 1902 – 10 November 1918 |
| Predecessor | Heinrich XXII |
| Born | 20 March 1878 Greiz, Principality of Reuss-Greiz, German Empire |
| Died | 13 October 1927 (aged 49) Greiz, Thuringia, German Reich |
| House | Reuss Elder Line |
| Father | Heinrich XXII, Prince Reuss of Greiz |
| Mother | Princess Ida of Schaumburg-Lippe |
Heinrich XXIV, Prince Reuss of Greiz (German: Heinrich XXIV Fürst Reuß zu Greiz; 20 March 1878 – 13 October 1927) was the last reigning Prince Reuss of Greiz from 1902 to 1918. Then he became head of the House Reuss of Greiz, which became extinct at his death in 1927.