| Gradinja | |
| Succession: | Ruler of Duklja (titular King) |
| Reign: | 1131–1142 or 1135–1146 |
| Predecessor: | George |
| Successor: | Radoslav |
| Issue: | Radoslav, Jovan, Vladimir |
| "King of Slavs" (titular) | |
| House: | Vojislavljević |
| House-Type: | Dynasty |
| Father: | Branislav |
| Birth Date: | ca. 1066[1] |
| Burial Place: | Monastery of Saints Sergius and Bacchus, Bojana |
| Death Date: | or |
| Religion: | Eastern Christianity |
Gradinja (Serbian: Градиња) or Gradihna (Serbian: Градихна; 1125–46) was the ruler of Duklja, from either 1131 to 1142 or 1135 to 1146. Gradinja is one of many persons (alongside Branislav, Gojislav, Georgije and Grubeša among others) mentioned only in the Chronicle of the Priest of Duklja (CPD), not found in Byzantine sources as the other Serbian rulers and royalty.[2] Gradinja was the son of Dukljan prince Branislav, and the brother of Grubeša, the former ruler (r. 1118–25).
Around 1125, Gradinja, the rival of Đorđe, married himself in Raška (Grand Principality of Serbia), with the "intent of returning the rule", according to Mavro Orbini.[3] Following the second war with the Byzantines, in which King Đorđe was defeated and imprisoned in the stronghold of Oblik, the Byzantines appointed Gradinja as ruler of Duklja, to rule as a vassal. According to the CPD, Gradinja was gentle, tame, compassionate and a protector of the widows and the poor. The power and territorial extent of Duklja was, in the time of his reign, greatly decreased.[4] His son Radoslav inherited the throne in 1146.
Gradinja was according to Gavro Škrivanić buried in the Church of Saints Sergius and Bacchus in Bojana.[5]
. John Van Antwerp Fine Jr.. The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century. 1991. 1983. Ann Arbor, Michigan. University of Michigan Press. 0472081497.
. Florin Curta. Southeastern Europe in the Middle Ages, 500–1250. 2006. Cambridge. Cambridge University Press. registration.
. Tibor Živković. Gesta Regum Sclavorum. 2009. 2. Београд-Никшић. Историјски институт, Манастир Острог.
. Tibor Živković. 2008. Forging unity: The South Slavs between East and West 550-1150. Belgrade. The Institute of History, Čigoja štampa. 9788675585732.
. Konstantin Jireček. Geschichte der Serben. 1911. 1. Gotha. Perthes.