Koblenz is an electoral constituency (German: Wahlkreis) represented in the Bundestag. It elects one member via first-past-the-post voting. Under the current constituency numbering system, it is designated as constituency 198. It is located in northern Rhineland-Palatinate, comprising the city of Koblenz, the eastern part of the Mayen-Koblenz district, and the western part of the Rhein-Lahn-Kreis district.^[1]

Koblenz was created for the inaugural 1949 federal election. Since 2017, it has been represented by Josef Oster of the Christian Democratic Union (CDU).^[2]

Koblenz is located in northern Rhineland-Palatinate. As of the 2021 federal election, it comprises the independent city of Koblenz, the municipality of Bendorf and the Verbandsgemeinden of Rhein-Mosel, Vallendar, and Weißenthurm from the Mayen-Koblenz district, and, from the Rhein-Lahn-Kreis district, the municipality of Lahnstein, the Verbandsgemeinde of Loreley, and the municipalities of Arzbach, Bad Ems, Becheln, Dausenau, Fachbach, Frücht, Kemmenau, Miellen, and Nievern from the Bad Ems-Nassau Verbandsgemeinde.^[1]

Koblenz was created in 1949. In the 1949 election, it was Rhineland-Palatinate constituency 3 in the numbering system. In the 1953 through 1976 elections, it was number 150. In the 1980 through 1998 elections, it was number 148. In the 2002 election, it was number 202. In the 2005 election, it was number 201. In the 2009 and 2013 elections, it was number 200. In the 2017 and 2021 elections, it was number 199. From the 2025 election, it has been number 198.

Originally, the constituency comprised the independent city of Koblenz and the districts of Landkreis Koblenz and Sankt Goar. In the 1972 through 1998 elections, it comprised the city of Koblenz, the municipality of Bendorf and the Verbandsgemeinden of Rhens, Untermosel, Vallendar, and Weißenthurm from the Mayen-Koblenz district, and the municipality of Boppard and the Verbandsgemeinden of Emmelshausen and Sankt Goar-Oberwesel from the Rhein-Hunsrück-Kreis district. It acquired its current borders in the 2002 election, although in 2014 the Verbandsgemeinde of Rhein-Mosel was created from Rhens and Untermosel, and the Verbandsgemeinde of Loreley absorbed Braubach.

The constituency has been held continuously by the Christian Democratic Union (CDU) since its creation. It was first represented by Karl Weber from 1949 to 1965. Egon Klepsch then served from 1965 to 1980. He was succeeded by Roswitha Verhülsdonk, who was representative until 1994. Karl-Heinz Scherhag served from 1994 to 2002. Michael Fuchs was representative from 2002 to 2017. Josef Oster succeeded him in 2017 and was re-elected in 2021.