Seuthes I (/ˈsˌθz/; Ancient Greek: Σεύθης, Seuthēs) was king of the Odrysian Thracians from 424 BC until ?410(407)BC. He was the nephew of Sitalces. After he became king, Seuthes increased the tribute of the Hellenic cities on the coast. In 411 BC Seuthes led a campaign against Athens. Seuthes died in ?410(407) BC after a serious illness. Amadocus succeeded him as ruler of the Odrysian kingdom.

Seuthes I
Born: Unknown Died: ?410 BC
Preceded by
King of Thrace
424–?410 BC
Succeeded by
Amadocus I