| Unhanagara Hatthadatha | |
| King of Anuradhapura | |
| Reign: | 691 |
| Predecessor: | Aggabodhi IV |
| Successor: | Manavanna |
| Dynasty: | House of Moriya |
Unhanagara Hatthadatha was a king of Anuradhapura in 691. Despite his title, he was more of a good Buddhist monarch, with real power being held by a Tamil minister named Poththakutta who also commanded a significant number of Tamil mercenaries garrisoned in the city.[1] He was placed in succession to deceased Aggabodhi IV and his reign caused further anarchy and discontent among the Buddhist Sinhalese majority of Anuradhapura and nearby.
He was defeated by Manavanna, a son of Kassapa II, who with assistance from Narasimhavarman II of the Pallavas, resolved the Moriya-Lambakanna conflict and restored the rule of the Lambakanna dynasty in Anuradhapura.