Joscelin III of Edessa (died 1190s) is the titular Count of Edessa from 1159 to his death.

He is the son of Joscelin II of Edessa and his wife Beatrice.

He inherites the title of "Count of Edessa" from his father, Joscelin II, although Edessa had been captured in 1144 and its remnants (including the Lordship of Turbessel) conquered or sold years before he takes the title.