| Bolle for Assembly
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| BOLT (Unregistered)
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| Bonnie Lee for Wisconsin
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| Books for County Board (Local-Dane County)
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| Boone for State Senate
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| Born for Assembly
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| Bosman for Mayor (Local-Kenosha, WI)
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| Bottoms Up Vending (Corporation)
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| Boucher for State Assembly
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| Bowen 4 Action (David Bowen)
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| Boyle for Assembly
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| BP Corp North America (was Amoco)
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| Bradley for Justice
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| Bradshaw Medical (Corporation)
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| Brady PAC
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| Brandemuehl for Assembly
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| Brandy Tollefson for School Board (Local-De Pere School District)
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| Braun for State Senate
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| Brechler for Congress
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| Breg Services (Corporation)
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