Ernst Casimir zu Ysenburg and Büdingen (disambiguation)
Ernst Casimir zu Ysenburg and Büdingen is the name of the following people:
- Ernst Casimir zu Ysenburg and Büdingen (1687–1749), regent of the county and Count of Ysenburg and Büdingen
- Ernst Casimir I (Ysenburg and Büdingen) (1781–1852), Brigadier General and Prince of Ysenburg and Büdingen
- Ernst Casimir II of Ysenburg and Büdingen (1806–1861), Prince of Ysenburg and Büdingen