Philip III of Namur, (1319 – Famagusta, September, 1337), was Count of Namur between 1336 and 1337.
He was the fourth son son of John I, Marquis of Namur, and Mary of Artois.
When his older brother Guy was killed in a tournament in Flanders in March 1336, Philip became his successor. At that time, Philip was in Sweden at the court of his sister Blanche of Namur, Queen consort of Sweden and Norway. From there he traveled to the Holy Land via Cyprus, with his brother-in-law Henry II of Vianden.
On his stop-over in Famagusta, he and his companions misbehaved to that extend, that the citizens of Famagusta killed them all. Philip and the Count of Vianden were buried in the Franciscan church of Famagousta.
| Preceded by Guy II, Marquis of Namur |
Marquis of Namur 1336–1337 |
Succeeded by William I |