Mannheim 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 275. It is located in northwestern Baden-Württemberg, comprising the city of Mannheim.^[1]

Mannheim was created for the inaugural 1949 federal election. Whilst the Christian Democratic Union won a plurality in the 2025 election, under the new voting system, their candidate did not actually win a seat in the Bundestag. This was due to the distribution of seats won by the CDU being decided by the first (direct) vote percentage of each winning CDU candidate, determining who took the seats. As the CDU candidate got a low vote of 24.7%, the seat will remain vacant throughout the 21st Bundestag.^[2]

Mannheim is located in northwestern Baden-Württemberg. As of the 2021 federal election, it is coterminous with the independent city of Mannheim.^[1]

Mannheim was created in 1949, then known as Mannheim-Stadt. In the 1965 through 1998 elections, it was named Mannheim I. It acquired its current name in the 2002 election. In the 1949 election, it was Württemberg-Baden Landesbezirk Baden constituency 2 in the number system. In the 1953 through 1961 elections, it was number 176. In the 1965 through 1998 elections, it was number 179. In the 2002 and 2005 elections, it was number 276. Since the 2009 election, it has been number 275.

Originally, the constituency was coterminous with the independent city of Mannheim. In the 1965 through 1972 elections, it comprised the Stadtbezirke of Innenstadt/Jungbusch, Neckarstadt-West, Neckarstadt-Ost/Wohlgelegen, Sandhofen, Schönau, Waldhof, Käfertal, Vogelstang, and Schwetzingerstadt/Oststadt from the city of Mannheim. In the 1976 election, it gained the Stadtbezirke of Feudenheim and Wallstadt. Since the 2002 election, it has again been coterminous with the city of Mannheim.

The constituency has been held by the Social Democratic Party (SPD) during all but four Bundestag terms since its creation. It was first represented by Carlo Schmid from 1949 to 1972, followed by Werner Nagel from 1972 to 1990. Siegfried Vergin then served one term. Egon Jüttner of the Christian Democratic Union (CDU) was elected in 1994, but Lothar Mark regained the constituency for the SPD in 1998, and served until 2009. Former member Jüttner was elected again in 2009, and served until 2017. Nikolas Löbel of the CDU was elected in 2017. Isabel Cademartori won the constituency for the SPD in 2021. The seat has been vacant since the 2025 election.

Under the new voting system implemented for the 2025 election, although the CDU candidate won the most votes in this constituency, due to the low winning percentage, the constituency seat will remain vacant as not enough second (party) votes were won to be allocated this seat.

Federal election (2025): Mannheim[3]
Notes:		Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively.
Party		Candidate		Votes	%	±%	Party votes	%	±%
	CDU	Melis Sekmen		37,564	24.7	4.8	35,226	23.1	4.9
	SPD	N Isabel Cademartori		34,133	22.5	3.9	27,685	18.2	7.1
	Greens	Nina Uschi Elke Wellenreuther		27,491	18.1	4.4	24,375	16.0	5.1
	AfD	Heinrich Friedrich Koch		27,165	17.9	8.1	26,730	17.6	8.4
	Left	Gökay Akbulut		12,114	8.0	3.1	17,209	11.3	6.3
	FDP	Konrad Johann Lorenz Stockmeier		6,389	4.2	6.4	7,836	5.1	8.0
	BSW						7,128	4.7
	APT	Dr. Lucia Lou-Anne Boileau		2,759	1.8		1,754	1.2	0.4
	Volt						1,485	1.0	0.4
	FW	Andre Kühner		2,626	1.7	0.5	1,127	0.7	0.6
	PARTEI	Félix Hugo Francisco Gimenez		1,441	0.9	0.4	824	0.5	0.5
	dieBasis						322	0.2	1.1
	Bündnis C						169	0.1
	ÖDP						167	0.1	0.1
	BD						144	0.1
	MLPD	Josef Eugen Buck		221	0.1		82	0.1
Informal votes				1,234			874
Total valid votes				151,903			152,263
Turnout				153,137	78.4	6.2
	Vacant gain from SPD		Majority

Federal election (2021): Mannheim[4]
Notes:		Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively.
Party		Candidate		Votes	%	±%	Party votes	%	±%
	SPD	Isabel Cademartori		37,102	26.4	1.6	35,651	25.3	4.1
	Greens	Melis Sekmen		31,723	22.5	9.4	29,814	21.1	8.0
	CDU	Roland Hörner		27,986	19.9	9.4	25,682	18.2	8.9
	FDP	Konrad Stockmeier		14,879	10.6	3.7	18,515	13.1	1.9
	AfD	Jörg Finkler		13,773	9.8	2.7	12,846	9.1	3.7
	Left	Gökay Akbulut		6,811	4.8	2.5	7,066	5.0	4.1
	Tierschutzpartei						2,178	1.5	0.5
	FW	Stephan Frauenkron		3,205	2.3	1.3	1,871	1.3	0.7
	dieBasis	Lars Ebert		2,276	1.6		1,845	1.3
	PARTEI	Simon Matheis		1,933	1.4	0.3	1,471	1.0	0.2
	Team Todenhöfer						1,212	0.9
	Volt						844	0.6
	Pirates						529	0.4	0.1
	ÖDP	Joachim Förster		500	0.4		241	0.2	0.0
	KlimalisteBW	Johanna Legnar		410	0.3
	Gesundheitsforschung						216	0.2
	Humanists						200	0.1
	The Homeland						146	0.1	0.2
	DiB						146	0.1	0.1
	Bündnis C						146	0.1
	Bürgerbewegung						136	0.1
	MLPD	Josef Buck		184	0.1	0.1	81	0.1	0.1
	DKP						58	0.0	0.0
	Bündnis 21						50	0.0
	LKR						23	0.0
Informal votes				1,350			1,165
Total valid votes				140,782			140,967
Turnout				142,132	72.2	0.8
	SPD gain from CDU		Majority	5,379	3.9

Federal election (2017): Mannheim[5]
Notes:		Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively.
Party		Candidate		Votes	%	±%	Party votes	%	±%
	CDU	Nikolas Löbel		41,812	29.3	10.5	38,746	27.1	7.9
	SPD	Stefan Rebmann		39,795	27.9	4.4	30,309	21.2	6.3
	Greens	Gerhard Schick		18,739	13.1	0.9	18,803	13.2	2.1
	AfD	Robert Schmidt		17,833	12.5		18,309	12.8	6.8
	Left	Gökay Akbulut		10,493	7.4	0.7	12,989	9.1	1.6
	FDP	Florian Kußmann		9,835	6.9	4.1	16,050	11.2	5.8
	PARTEI	Patrick H.P. Siegert		2,337	1.6	0.9	1,807	1.3
	Tierschutzpartei						1,552	1.1	0.1
	FW	Martin Marino-Haffner		1,444	1.0		826	0.6	0.2
	Pirates						689	0.5	2.7
	Tierschutzallianz						414	0.3
	BGE						395	0.3
	The Homeland						381	0.3	0.9
	DiB						311	0.2
	V-Partei³						246	0.2
	DM						240	0.2
	ÖDP						231	0.2	0.0
	Menschliche Welt						186	0.1
	MLPD	Josef Buck		286	0.2	0.0	160	0.1	0.0
	DKP						46	0.0
	DIE RECHTE						33	0.0
Informal votes				1,504			1,355
Total valid votes				142,574			142,723
Turnout				144,078	73.0	3.6
	CDU hold		Majority	2,017	1.4	6.0

Federal election (2013): Mannheim[6]
Notes:		Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively.
Party		Candidate		Votes	%	±%	Party votes	%	±%
	CDU	Y Egon Jüttner		53,819	39.8	3.3	47,598	35.1	6.0
	SPD	Stefan Rebmann		43,736	32.4	2.2	37,367	27.5	2.9
	Greens	Gerhard Schick		16,544	12.2	0.4	15,047	11.1	2.6
	Left	Michael Schlecht		8,951	6.6	2.9	10,227	7.5	3.8
	AfD						8,148	6.0
	Pirates	Stefan Täge		4,606	3.4		4,287	3.2	0.7
	FDP	Birgit Reinemund		3,772	2.8	6.1	7,427	5.5	9.6
	The Homeland	Silvio Waldheim		2,514	1.9	0.0	1,585	1.2	0.2
	Tierschutzpartei						1,378	1.0	0.2
	PARTEI	Peter Mendelsohn		955	0.7
	REP						514	0.4	0.4
	RENTNER						497	0.4
	FW						465	0.3
	ÖDP						278	0.2	0.0
	Volksabstimmung						277	0.2	0.0
	PBC						162	0.1	0.1
	PRO						136	0.1
	MLPD	Josef Buck		270	0.2	0.1	120	0.1	0.0
	BIG						104	0.1
	Party of Reason						100	0.1
	BüSo						27	0.0	0.0
Informal votes				2,629			2,052
Total valid votes				135,167			135,744
Turnout				137,796	69.4	1.8
	CDU hold		Majority	10,083	7.4	1.1

Federal election (2009): Mannheim[7]
Notes:		Blue background denotes the winner of the electorate vote. Pink background denotes a candidate elected from their party list. Yellow background denotes an electorate win by a list member, or other incumbent. A Y or N denotes status of any incumbent, win or lose respectively.
Party		Candidate		Votes	%	±%	Party votes	%	±%
	CDU	Egon Jüttner		48,137	36.5	0.9	38,435	29.0	2.0
	SPD	Stefan Rebmann		39,845	30.2	15.7	32,627	24.7	12.5
	Greens	Gerhard Schick		16,648	12.6	6.8	18,052	13.6	2.8
	Left	Michael Schlecht		12,520	9.5	3.2	14,936	11.3	4.7
	FDP	Birgit Reinemund		11,782	8.9	4.3	19,900	15.0	5.1
	Pirates						3,258	2.5
	The Homeland	Silvio Waldheim		2,418	1.8		1,772	1.3	0.0
	Tierschutzpartei						1,090	0.8
	REP						987	0.7	0.4
	Independent	Sultan Ulusoy		311	0.2
	Volksabstimmung						286	0.2
	DIE VIOLETTEN						239	0.2
	PBC						238	0.2	0.1
	ÖDP						236	0.2
	MLPD	Josef Buck		333	0.3		121	0.1	0.0
	DVU						73	0.1
	BüSo						60	0.0	0.1
	ADM						48	0.0
Informal votes				2,149			1,785
Total valid votes				131,994			132,358
Turnout				134,143	67.6	6.1
	CDU gain from SPD		Majority	8,292	6.3