| Baginski, Albert-Josef | | | |
| Baldy MdB, Daniel | SPD | | |
| Bankwitz, Michael | BÜNDNIS 90/DIE GRÜNEN | | |
| Baumert, Christopher | Stadtjugendring Mainz e.V. | | |
| Baßler, Dr. Michael | BÜNDNIS 90/ DIE GRÜNEN | | |
| Becher, Benjamin | | | |
| Beck, Günter | | | |
| Becker, Christopher | CDU | | |
| Becker, Prof. Dr. Manfred | FDP | | |
| Becker, Marco | CDU | | |
| Beckmann, Stefan | AfD | | |
| Beckmann, Ulrike | AfD | | |
| Bednarz, Beatrice | BÜNDNIS 90/DIE GRÜNEN | | |
| Beer, Benedikt Franz Jacob | BÜNDNIS 90/ DIE GRÜNEN | | |
| Bender, Markus | CDU | | |
| Berg, Dieter | FWG (Stadt Ingelheim, OT Wackernheim) | | |
| Berg, Valentina | DIE PARTEI | | |
| Besch, Monika | | | |
| Beyer, Francesca | Volt | | |
| Beyer-Herrero, Fabian | | | |
| Bibbert, Rainer | | | |
| Bicknell, Teresa | BÜNDNIS 90/DIE GRÜNEN | | |
| Bludau, Simone | SPD | | |
| Blüm, Johannes | SPD | | |
| Bohn, Meike | AfD | | |
| Bohnen, Cara | FW | | |
| Boos-Waidosch, Marita | BÜNDNIS90/DIE GRÜNEN | | |
| Both, Lothar | CDU | | |
| Both, Lothar | dbb Beamtenbund Rheinhessen | | |
| Brabandt, Carola | BÜNDNIS90/DIE GRÜNEN | | |
| Braun, Hans-Dieter | | | |
| Brink, Margot | FDP | | |
| Brucherseifer, Angelika | CDU | | |
| Brumby, Prof. Dr. Lennart | SPD | | |
| Bräger, Jürgen | ÖDP | | |
| Bräuninger, Gisela | BÜNDNIS 90/DIE GRÜNEN (Stadt Ingelheim, OT Wackernheim) | | |
| Bröhling-Kusterer, Julia | | | |
| Buhrow, Laura Maria | ÖDP | | |
| Busch, Gerlinde | | | |
| Buus, Dr. Marcel | BÜNDNIS 90/ DIE GRÜNEN | | |
| Böcher, Horst | SPD | 07.11.2024 | bis 07.11.2024 |
| Böhm, Gisela | | | |
