| Native Name: | Grafschaft Solms-Rödelheim-Assenheim |
| Conventional Long Name: | County of Solms-Rödelheim-Assenheim |
| Common Name: | Solms-Rodelheim-Assenheim |
| Era: | Middle Ages |
| Status: | Vassal |
| Empire: | Holy Roman Empire |
| Government Type: | Principality |
| Year Start: | 1635 |
| Year End: | 1806 |
| Life Span: | 1635–1699 1722–1728 1778–1806 |
| Event Start: | Union of S-Rödelheim and S-Assenheim |
| Event1: | Repartitioned in twain |
| Date Event1: | 1699 |
| Event2: | Reunited |
| Date Event2: | 1722 |
| Event3: | Repartitioned |
| Date Event3: | 1728 |
| Event4: | Reunited |
| Date Event4: | 1778 |
| Event End: | Mediatised to Hesse- -Kassel and -Darmstadt |
| P1: | Solms-Assenheim |
| P2: | Solms-Rödelheim |
| S1: | Grand Duchy of Hesse |
| Flag S1: | Flagge Großherzogtum Hessen ohne Wappen.svg |
| S2: | Landgraviate of Hesse-Kassel |
| Flag S2: | Flag of Hesse.svg |
| Capital: | Rödelheim |
Solms-Rödelheim-Assenheim was a County of southern Hesse and eastern Rhineland-Palatinate, Germany. The House of Solms[1] had its origins at Solms, Hesse.
Solms-Rödelheim-Assenheim was thrice created by a union of the Counts of Solms-Assenheim and Solms-Rödelheim, and on the first two occasions repartitioned into those statelets. Solms-Rödelheim-Assenheim was mediatised to Hesse-Kassel (or Hesse-Cassel) and Hesse-Darmstadt in 1806.
Ludwig Heinrich, Count 1722-1728 (1667-1728), third surviving son of Johann August, inherited Assenheim 1699, Rödelheim 1722