Uncelen, Uncelin, or Uncilin (from Latin Uncelenus; died c. 613) was the Duke of Alemannia from 587 to 607.
On Childebert's death in 595, the Thurgau, Kembsgau, and Alsace passed to the Kingdom of Burgundy, then under the rule of Theuderic II.
His army, which did not wish to go to war, he placed under the command of his majordomo Protadius with instructions to induce the soldiers to fight.
The next year (606) at Quierzy-sur-Oise, Theuderic re-assembled the army, but the men once again refused to fight their countrymen and the king ordered Uncelen to coerce them.
The despised majordomo was killed by the warriors and the king was forced to sign a treaty.