| Operative Plasterers' & Cement Masons' Intl Assn Action Committee (Federal)
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| OpPAC (Oppenheimer Funds) (Federal)
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| Opper for DA
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| Opportunity & Renewal PAC (Federal)
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| Opportunity First PAC (Federal)
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| Opternative (Corporation)
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| Orange County Fire Fighters Association (Unregistered, Florida)
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| Organization Management Services Inc (Corporation)
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| Organizing Empowerment PAC
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| Organizing Empowerment PAC
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| Original Wisconsin Ducks (Corporation)
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| ORP Management - Oconomowoc Residential Programs (Corporation)
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| Ortiz for Alder (Local-Racine, WI)
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| Osegard for Assembly
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| Oshkosh Education Assn. PAC
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| Oshkosh Police Benevolent PAC
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| Oshkosh Tavern League
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| Oshkosh Truck PAC (Federal)
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| Osteopathic PAC (Federal)
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| Otsuka America Pharmaceutical Inc PAC (Federal)
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