Raymond III of Tripoli (c 1140 – September/October 1187) was Count of Tripoli from 1152 to 1187 and Prince of Galilee and Tiberias in right of his wife Eschiva.
Raymond was a great-great-grandson of Raymond IV of Toulouse (Raymond I of Tripoli). He succeeded his father Raymond II, who had been killed by the Hashshashin, in 1152, when he was young. His mother, princess Hodierna of Jerusalem, daughter of King Baldwin II, ruled as regent until Raymond came of age a few years later. He was also known as Raymond the Younger to distinguish him from his father.
In 1160, Byzantine emperor Manuel I Komnenos was seeking a wife from the Crusader states. The two candidates presented to him were Raymond's sister Melisende, and Princess Maria of Antioch. At first, Melisende was chosen, and Raymond collected an enormous dowry, while negotiations continued for over a year (during this time he prepared a fleet of 12 galleys to escort Melisende). However, Manuel's ambassadors heard the rumours that Melisende (and Raymond himself) might have been fathered by someone other than Raymond II, and the marriage was called off; Manuel married Maria instead. Raymond, feeling slighted for both himself and his sister, responded by converting the galleys into men-of-war to plunder the Byzantine island of Cyprus. Melisende later entered a convent, where she died fairly young.
In 1164 Raymond and Bohemund III of Antioch marched out to relieve Harim, which was under siege by Nur ad-Din Zengi. The crusader army was defeated in the ensuing battle on August 12; Raymond, Bohemund, Joscelin III of Edessa, Hugh VIII of Lusignan, and others were taken captive and imprisoned in Aleppo. Raymond remained in prison until 1173, when he was ransomed for 80,000 pieces of gold. During his captivity, King Amalric I of Jerusalem ruled as regent of the county, and dutifully returned it to Raymond once he was released.