The Departmental Council of Yonne () is the deliberative assembly of the French department of Yonne in the region of Bourgogne-Franche-Comté. It includes 42 departemental councillors from the 21 cantons of Yonne, elected for a term of six years. It is chaired by Patrick Gendraud (LR).
The head office of the departmental council is located in Auxerre.
In 2021, the council has a budget of 455.66 million euros:
The President of the Departmental Council is assisted by 12 vice-presidents chosen from among the departmental advisers. Each of them has a delegation of authority.