Jacob I of Sierk was the Archbishop of Trier from 1439 until 1456.

Jacob I attempted to reorganise the disastrous finances of the archbishopric, but as a supporter of the Antipope Felix V and the Council of Basel, he was deposed.

Preceded by:

Jacob I of Sierk

Succeeded by:

Raban of Helmstatt Archbishop of Trier
1439 - 1456
John II of Baden