| Ferdinand, Prince of Solms-Braunfels | |
| House: | House of Solms-Braunfels |
| Father: | Frederick William, Prince of Solms-Braunfels |
| Mother: | Princess Magdalena Henrietta of Nassau-Weilburg |
| Spouse: | Countess Sophie of Solms-Laubach |
| Issue: | Wilhelm, Prince of Solms-Braunfels Prince Frederick William |
| Birth Place: | Braunfels |
| Death Place: | Braunfels |
Ferdinand Wilhelm Ernst, 2nd Prince of Solms-Braunfels (8 February 1721 in Braunfels – 2 October 1783, ibid.) was the second Prince of Solms-Braunfels. He was the son of Frederick William, Prince of Solms-Braunfels (1696–1761) by his first wife Princess Magdalena Henrietta of Nassau-Weilburg (1691–1725).
Ferdinand Wilhelm Ernst was born in Braunfels, Solms-Braunfels as the first son and child of Frederick William, Count of Solms-Braunfels and his first wife Princess Magdalena Henriette of Nassau-Weilburg (1691–1725) daughter of Johann Ernst, Prince of Nassau-Weilburg. On 22 May 1742, Emperor Charles VII raised the House of Solms-Braunfels to the rank of Imperial Prince and so when his father died he succeeded him as the 2nd Prince.
On 24 August 1756 he married in Laubach, Countess Sophie Christine Wilhelmine of Solms-Laubach. She was the first daughter and second child of Christian August, Count of Solms-Laubach and his first wife Princess Elisabeth of Isenburg und Büdingen zu Birstein daughter of the first Prince, Wolfgang Ernest I. They had the following children: