Jahnatal (, ) is a municipality in the district of Mittelsachsen in Saxony in Germany. It was established on 1 January 2023 with the merger of the municipalities of Ostrau and Zschaitz-Ottewig.
Jahnatal is located north of the town of Döbeln and about south of Riesa, in the valley of Jahna and the surrounding ridges in the north-west of Lommatzscher Pflege.
Jahnatal consists of the following villages ():
On 1 January 2023, the municipalities of Ostrau and Zschaitz-Ottewig merged to form the new municipality of Jahnatal.