| Philip Joseph | |
| Prince of Salm-Kyrburg | |
| Noble Family: | House of Salm |
| Father: | Hendrik Gabriel Joseph of Salm-Kyrburg |
| Mother: | Princess Maria Theresia de Croÿ |
| Spouse: | Princess Maria Theresa van Hornes |
| Birth Date: | 31 December 1709 |
| Death Date: | 1 January 1779 (aged 69) |
Philip Joseph, Prince of Salm-Kyrburg (1709–1779) was the first prince of Salm-Kyrburg, from 1743 to 1779.
Philip Joseph was the second son of Hendrik Gabriel Joseph of Salm-Kyrburg (1674–1716), regent of Salm-Kyrburg from 1696 to 1716, and his wife Princess Maria Theresia de Croÿ (1678–1713), daughter of Philippe François Albert de Croÿ, marquis de Warneck (1645–1710). His paternal grandfather was general (1638–1676). He had an elder brother, (1708–1778), and a sister, Henriëtte (who married Maximilian, Prince van Hornes (1695–1763), who already had two daughters from a previous marriage, the eldest of whom later married Philip Joseph).
The Salm-Mörchingen family lost the titles of "Wildgrave of Dhaun" and "Rhinegrave of Stein" in 1681, when they lacked a male successor. Salm-Kyrburg was from then on run by regents on their behalf. Philip Joseph reigned with his brother John from 1716. When Salm-Kyrburg again arose, this time as a principality, Philip Joseph became its first prince.
He married in 1742 to Princess Maria Theresa van Hornes (1725-1783), who was made her father's sole heir in 1763, with his titles and country estates thus passing to the princes of Salm-Kyrburg. Emanuel's other daughter, Princess Elisabeth of Hornes, widow of Gustaaf Adolf, Prince of Stolberg-Gedern and mother of Charles Edward Stuart's wife Louise, agreed to this without protest.
Philip Joseph and Maria Theresa had 10 children, including a pair of twins: