约讷省（法文：Yonne）是法国勃艮第大区所辖的省份。该省编号为89。

Yonne (French pronunciation: ​[jɔn]) is a French department named after the river Yonne. It is one of the eight constituent departments of Bourgogne-Franche-Comté and is located in the northwest of the region, bordering Île-de-France. It was created in 1790 during the French Revolution. Its prefecture (capital) is Auxerre and its postcode number is 89.