10608 committees
| Name | Candidate | Type | Party | City | First Registered |
|---|---|---|---|---|---|
| Orange Taxpayers Association | John J. Donohue | Political Action Committee | — | Orange | Nov. 8, 1999 |
| Orange First, Connecticut First, A Committee | Jane E Opper | Political Action Committee | — | Orange | June 7, 2010 |
| Orange Democratic Town Committee | Joseph A. Lembo | Party Committee | Democrat | Orange | July 8, 1998 |
| Orange 2018 | Linda A Orange | Candidate Committee | Democrat | Colchester | Feb. 1, 2018 |
| Orange 2016 | Linda A Orange | Candidate Committee | Democrat | Colchester | Feb. 16, 2016 |
| Orange 2014 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Feb. 21, 2014 |
| Orange 2012 | Linda A. Orange | Candidate Committee | Democrat | Colchester | March 1, 2012 |
| Orange 2010 | Linda A. Orange | Candidate Committee | Democrat | Colchester | March 3, 2010 |
| Orange 2008 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Jan. 31, 2008 |
| Orange 2006 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Jan. 11, 2006 |
| Orange 2004 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Dec. 31, 2003 |
| Orange 2002 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Jan. 11, 2002 |
| Orange 2000 | Linda A. Orange | Candidate Committee | Democrat | Colchester | Feb. 10, 2000 |
| Opinsky for the House - 19th | Jack S. Opinsky | Candidate Committee | Democrat | West Hartford | July 24, 2002 |
| Operating Engineers' Local 478 Political Action Committee - State | Benedict W. Cozzi | Political Action Committee | — | Hamden | Oct. 23, 2008 |
| OPerating Engineers Politcal Committee | — | Political Action Committee | — | Hamden | Nov. 19, 2006 |
| Operating Engineers PAC | — | Political Action Committee | — | Hamden | Dec. 3, 2006 |
| Operating Engineers Continuing Political Committee | Garry W. Gyenizs | Political Action Committee | — | Hamden | April 7, 2000 |
| OPERATING ENGINEERS CONTINUING POLITICAL COMMITTEE | — | Political Action Committee | — | Hamden | April 9, 2002 |
| Operating Engineers Continuing Political Action Committee | — | Political Action Committee | — | Hamden | Aug. 26, 2002 |
| Operating Engineers Continuing Politcal Committee | — | Political Action Committee | — | Hamden | Dec. 28, 2003 |
| Operating Engineers Continuing PAC | — | Political Action Committee | — | Hamden | Feb. 8, 2002 |
| Operating Engineers Consulting PAC | — | Political Action Committee | — | Hamden | April 11, 2002 |
| OPERATING ENGINEERS | — | Political Action Committee | — | Hamden | Nov. 7, 2002 |
| Operating Engineers | — | Political Action Committee | — | Hamden | Oct. 31, 2005 |
| Operating Engineer Continuing PAC | — | Political Action Committee | — | Hamden | Feb. 11, 2002 |
| OO For CT | Olaleye Onikuyide | Candidate Committee | Democrat | West Hartford | Jan. 16, 2026 |
| One Windham | Lynne C. Ide | Political Action Committee | — | Willimantic | Jan. 8, 2002 |
| One Wallingford | — | Political Action Committee | — | Wallingford | Dec. 1, 2019 |
| One New London | Thomas P Lacey | Party Committee | One New London | New London | July 12, 2007 |
| One Bloomfield | Joseph M. Suggs | Political Action Committee | — | Bloomfield | May 30, 2003 |
| Ondusko For Norwich | Dianne G. Ondusko | Candidate Committee | Democrat | Norwich | Aug. 17, 2000 |
| On Target | Jason E Lebel | Political Action Committee | — | Wallingford | Dec. 17, 2020 |
| Olkin for Probate | Mathew R Olkin | Candidate Committee | Democrat | Willimantic | July 26, 2024 |
| Oliver for State Rep. | Mary A. Oliver | Candidate Committee | Democrat | Vernon | Jan. 28, 2002 |
| Oliveira 2006 | Christopher F. Oliveira | Exploratory Committee | — | Old Lyme | Jan. 2, 2006 |
| Olin Corporation Good Government Fund of Connecticut | William B. McDaniel | Political Action Committee | — | Norwalk | Jan. 1, 1998 |
| Olin Corporation Good Government Fund Of Connecticut | Dolores J Ennico | Political Action Committee | — | Wilton | Jan. 1, 1998 |
| Olga Anastos for State Representative | Olga Anastos | Candidate Committee | Republican | Stamford | Jan. 25, 2023 |
| Olga Anastos | Olga Anastos | Candidate Exemption Committee | Republican | Stamford | June 7, 2024 |
| Oldfield for Mayor | Jon Z Oldfield | Candidate Committee | Unaffiliated | Norwich | April 26, 2017 |
| Old Saybrook Women's Republican Club | — | Political Action Committee | Republican | Old Saybrook | Dec. 19, 2002 |
| Old Saybrook Republican Women's Club | Eileen C. Torrenti | Political Action Committee | Republican | Old Saybrook | July 22, 1999 |
| Old Saybrook Republican Town Committee | Margaret B. Viggiano | Party Committee | Republican | Old Saybrook | July 8, 1998 |
| Old Saybrook Democratic Town Committee | Deborah C Shah | Party Committee | Democrat | Old Saybrook | July 8, 1998 |
| Old Lyme Republican Town Committee | Diane Atwood Johnson | Party Committee | Republican | Old Lyme | July 8, 1998 |
| Old Lyme Democratic Town Committee | David B. Woolley | Party Committee | Democrat | South Lyme | July 8, 1998 |
| Ohler 2020 | Brian M Ohler | Candidate Committee | Republican | Canaan | May 11, 2020 |
| Ohler 2018 | Brian M Ohler | Candidate Committee | Republican | North Canaan | Jan. 12, 2018 |
| Ohler 2016 | Brian M Ohler | Candidate Committee | Republican | Canaan | May 4, 2016 |