10608 committees
| Name | Candidate | Type | Party | City | First Registered |
|---|---|---|---|---|---|
| P.S.E.C. PAC | — | Political Action Committee | — | Newington | Oct. 27, 2002 |
| P & E PAC | Peter J. Panaroni | Political Action Committee | — | Branford | Jan. 27, 2003 |
| Oz For Governor, Inc. | R. Nelson Griebel | Candidate Committee | Republican | West Hartford | Jan. 28, 2010 |
| Oz for Governor, Inc. | Oz Griebel | Candidate Committee | Unaffiliated | Hartford | Dec. 21, 2017 |
| Oz For Governor | R. Nelson Griebel | Candidate Committee | Republican | West Hartford | Jan. 28, 2010 |
| Oz 2018, Inc. | Oz Griebel | Candidate Committee | Unaffiliated | Hartford | Dec. 21, 2017 |
| Oxford Young Republicans | Jerry Schwab | Political Action Committee | — | Oxford | Aug. 20, 2003 |
| Oxford Republican Town Committee | August Palmer | Party Committee | Republican | Oxford | July 9, 1998 |
| Oxford Libertarian Town Committee | John M. Joy | Political Action Committee | Republican | Oxford | April 17, 2001 |
| Oxford Helth Plans PAC | — | Political Action Committee | — | Trumbull | Jan. 6, 2007 |
| Oxford Health Plans CT-Comm for Quality Health Care | — | Political Action Committee | — | Trumbull | Sept. 29, 2002 |
| Oxford Health Plans Connecticut Committee for Quality Health Care | — | Political Action Committee | — | Trumbull | Oct. 10, 2002 |
| Oxford Health Plans Connecticut Committee | Scott M. Schwartz | Political Action Committee | — | Trumbull | Dec. 29, 1999 |
| Oxford Health Plans Connecticut | — | Political Action Committee | — | Trumbull | Oct. 3, 2006 |
| Oxford Democratic Town Committee | Katherine P. Johnson | Party Committee | Democrat | Oxford | July 9, 1998 |
| Oxford Bull Moose Party | Fredrick J. Pommer | Political Action Committee | — | Oxford | Jan. 14, 2000 |
| Owen P Eagan | Owen P Eagan | Candidate Exemption Committee | Democrat | West Hartford | Jan. 26, 2018 |
| Outdoor Advertising Association of Connecticut PAC | John E. Barrett | Political Action Committee | — | Windsor | Dec. 12, 2003 |
| Outdoor Advertising Association Of Connecticut PAC | Stephen E. Hebert | Political Action Committee | — | Bridgeport | Dec. 12, 2003 |
| Outdoor Advertising Assoc of CT | — | Political Action Committee | — | Bridgeport | March 30, 2006 |
| Our Revolution Central Connecticut | Bobby Berriault | Political Action Committee | — | New Britain | July 30, 2017 |
| Our CT Values Fund | Eli B Sabin | Political Action Committee | — | New Haven | Feb. 20, 2025 |
| OUR CONNECTICUT PAC | Joseph Shafer | Independent Expenditure Political Committee | — | West Hartford | July 18, 2018 |
| OTooleforCT29 | Michael J O'Toole | Candidate Committee | Republican | Rocky Hill | March 19, 2018 |
| Oswald J Brown | Oswald J Brown | Candidate Exemption Committee | Democrat | Hamden | June 30, 2017 |
| Osten For The 47Th In 2012 | Catherine A. Osten | Candidate Committee | Democrat | Baltic | March 5, 2012 |
| Osten For State Representative | Catherine A. Osten | Candidate Committee | Democrat | Baltic | March 2, 2010 |
| Osten 2018 | Catherine Osten | Candidate Committee | Democrat | Baltic | Jan. 8, 2018 |
| Osten 2016 | Catherine A Osten | Candidate Committee | Democrat | Baltic | Jan. 26, 2016 |
| Osten 2014 | Catherine A. Osten | Candidate Committee | Democrat | Baltic | March 27, 2014 |
| Osten 2012 | Catherine A. Osten | Candidate Committee | Democrat | Baltic | May 22, 2012 |
| Osten 2010 | Catherine A. Osten | Candidate Committee | Democrat | Taftville | March 2, 2010 |
| Osmanu for State Rep | Abdul Osmanu | Candidate Committee | Democrat | Hamden | May 20, 2024 |
| Osgood For CT | Whit Osgood | Candidate Committee | Republican | Manchester | April 9, 2014 |
| Osella for State Representative | Ron Osella | Candidate Committee | Republican | Manchester | July 22, 2002 |
| Osborne For Senate | Melissa E Osborne | Candidate Committee | Democrat | Simsbury | April 28, 2014 |
| Osborne 2026 | Melissa E Osborne | Candidate Committee | Democrat | Weatogue | Jan. 15, 2026 |
| Osborne 2024 | Melissa E Osborne | Candidate Committee | Democrat | Weatogue | Nov. 15, 2023 |
| Osborne 2022 | Melissa E Osborne | Candidate Committee | Democrat | Weatogue | May 4, 2022 |
| Osborne 2020 | Melissa E Osborne | Candidate Committee | Democrat | Torrington | Nov. 25, 2019 |
| Osborne 2018 | Melissa E Osborne | Candidate Committee | Democrat | Torrington | May 24, 2018 |
| Ortiz For State Representative | Jason J Ortiz | Candidate Committee | Unaffiliated | Mansfield | June 2, 2010 |
| Orsini For Senate 2014 | Donato Orsini | Candidate Committee | Democrat | Watertown | May 27, 2014 |
| Orsini 2010 | Donato Orsini | Candidate Committee | Democrat | Watertown | June 18, 2010 |
| Orosco22 | Steven R Orosco | Candidate Committee | Republican | New Haven | Feb. 8, 2022 |
| Orosco 2025 | Steven R Orosco | Candidate Committee | Republican | New Haven | April 11, 2025 |
| Orosco 2024 | Steven R Orosco | Candidate Committee | Republican | New Haven | Feb. 24, 2024 |
| Orlando Cordero | Orlando Cordero | Candidate Exemption Committee | Democrat | New Haven | July 17, 2017 |
| Orefice 2002 | Gary J. Orefice | Candidate Committee | Democrat | Niantic | May 20, 2002 |
| Orefice 2000 | Gary J. Orefice | Candidate Committee | Democrat | Niantic | May 12, 2000 |