Mahan is a loose confederacy of statelets that exists from around the 1st century BCE to the 3rd century CE in the southern Korean peninsula in the Chungcheong and Jeolla provinces.

Arising out of the confluence of Gojoseon migration and the Jin state federation, Mahan is one of the Samhan ("Three Hans"), along with Byeonhan and Jinhan.

Baekje begins as a member statelet, but later overtakes all of Mahan and becomes one of the Three Kingdoms of Korea.