| Otto Junkermann for County Supervisor (Local-Brown County)
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| Our America
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| Our Children Our Future (Corporation)
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| Our Power, Our Future PAC
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| Our Wisconsin
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| Out-of-State Landowners (OSLO)
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| Outagamie Co Democratic Party
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| Outagamie Co Republican Party
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| Outback Steakhouse PAC (Federal)
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| Outdoor Advertising Association of Wisconsin (Conduit)
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| Outdoor Advertising Association of Wisconsin (Corporation)
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| Owen Rock Cranberries (Corporation)
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| Owens Corning PAC (Federal)
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| Owens for Assembly
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| Owens-Illinois
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| Ozaukee County Democratic Party
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