Jena – Sömmerda – Weimarer Land I is an electoral constituency (German: Wahlkreis) represented in the Bundestag.

[1] Jena – Sömmerda – Weimarer Land I was created for the inaugural 1990 federal election after German reunification.

As of the 2021 federal election, it comprises the independent city of Jena, the Sömmerda district, and the entirety of the Weimarer Land excluding the municipality of Grammetal.

Originally, the constituency comprised the districts of Sömmerda, Artern, Sondershausen, and Langensalza.

In the 2002 election, it comprised the districts of Sömmerda and Kyffhäuserkreis as well as the municipalities of Mühlhausen, Anrode, Dünwald, Herbsleben, Menteroda, Weinbergen, and Unstruttal and the Verwaltungsgemeinschaften of Bad Tennstedt, Hildebrandshausen/Lengenfeld unterm Stein, and Schlotheim from the Unstrut-Hainich-Kreis district.

In the 2005 through 2013 elections, it comprised districts of Sömmerda, Kyffhäuserkreis, and Weimarer Land excluding the municipality of Grammetal.

Gisela Hilbrecht won it for the Social Democratic Party (SPD) in 1998 and served until 2005, when Peter Albach regained it for the CDU.

Yellow background denotes an electorate win by a list member, or other incumbent.