| O'Malley For President (Federal Candidate)
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| Oak Park Fire Fighters (Unregistered, Illinois)
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| OB-GYN PAC (Federal)
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| OC Local 1848 PAC
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| Oconomowoc Education Association
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| Oconto County Republican Party
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| Odeen for Wisconsin
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| Of the People
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| Office & Professional Employees Union Local 39
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| Ohio Assocation of Professionals Firefighters (Unregistered)
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| Ohio Gun Collectors Association PAC
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| Okray Family Farms (Corporation)
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| Old National Bank PAC (Federal)
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| Oldenburg for Assembly
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| OLoughlin for County Supervisor (Local-Dane County)
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| Olsen for Senate
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| Olson for Senate
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| Omaha Firefighters Local 385 Political Action Fund (Unregistered, Nebraska)
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| OMG WTF Wisconsin PAC (Out-of-state: California)
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| On We Press (Elisabeth Epps) (Out-of-state: Colorado)
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