Jinhan was a loose confederacy of chiefdoms that existed from around the 1st century BC to the 4th century AD in the southern Korean peninsula, to the east of the Nakdong River valley, Gyeongsang Province. Jinhan was one of the Samhan (or "Three Hans"), along with Byeonhan and Mahan. Apparently descending from the Jin state of southern Korea, Jinhan was absorbed by the later Silla, one of the Three Kingdoms of Korea.

Jinhan, like the other Samhan confederacies, arose out of the confusion and migration following the fall of Gojoseon in 108 BC.

Its relation to the earlier state of Jin is not clear, although the contemporary Chinese chronicle San Guo Zhi alleges that Jinhan was identical with Jin (while another record describes Jin as the predecessor of the Samhan as a whole). Jinhan and Byeonhan shared essentially the same culture, with varying religious customs, and apparently were not separated by a clear boundary.

The people claimed they were descendants of Qin dynasty migrants, fleeing Qin's force labor policies moved to the Mahan confederacy which give them the east land. The confederacy was also called Qinhan (秦韓). As immigrants, the kings have to be Mahan people. But there is no further archeleogical evidences to prove this is true.