| Name | Title | Court | County | Rate this Judge | Rating | # of Ratings |
| Hon. Beverly Reid O'Connell | Judge |
Superior Court
| Los Angeles |  | 4.4 | 3 |
| Hon. Kathleen O'Connor | Judge |
Superior Court
| Yuba | | | 0 |
| Hon. Kathleen O'Connor | Judge |
Superior Court
| Yuba | | | 0 |
| Hon. Joanne O'Donnell | Judge |
Superior Court
| Los Angeles | | 3.2 | 5 |
| Hon. Robert O'Farrell | Judge |
Superior Court
| Monterey | | | 0 |
| Hon. Joseph O'Flaherty | Judge |
Superior Court
| Placer | | 1.5 | 1 |
| Hon. Michael O'Gara | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Mary Ann O'Malley | Judge |
Superior Court
| Contra Costa | | 3.4 | 1 |
| Hon. Robert O'Neill | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Robert O'Neill | Judge |
Superior Court
| San Diego | | | 0 |
| Hon. Vincent O'Neill, Jr. | Judge |
Superior Court
| Ventura | | | 0 |
| Hon. James Oakley | Judge |
Superior Court
| Madera | | 8.8 | 2 |
| Hon. David Oberholtzer | Judge |
Superior Court
| San Diego | | 5.6 | 4 |
| Hon. Richard Oberholzer | Judge |
Superior Court
| Kern | | | 0 |
| Hon. Ricardo Ocampo | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Frank Ochoa | Judge |
Superior Court
| Santa Barbara | | 4.1 | 1 |
| Hon. Steven Ogden | Judge |
Superior Court
| Los Angeles | | 1.0 | 1 |
| Hon. John Oglesby | Judge |
Superior Court
| Kern | | 5.6 | 3 |
| Hon. Gail Ohanesian | Judge |
Superior Court
| Sacramento | | | 0 |
| Hon. Sam Ohta | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Vincent Okamoto | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Dan Thomas Oki | Judge |
Superior Court
| Los Angeles | | 9.3 | 2 |
| Hon. Margaret Oldendorf | Judge |
Superior Court
| Los Angeles | | 7.4 | 5 |
| Hon. Margaret Oldendorf | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Robert Oliver | Judge |
Superior Court
| Fresno | | | 0 |
| Hon. Elizabeth Ufkes Olivera | Judge |
Superior Court
| Colusa | | | 0 |
| Hon. Charlaine Olmedo | Judge |
Superior Court
| Los Angeles | | 8.9 | 1 |
| Hon. Lynn Olson | Judge |
Superior Court
| Los Angeles | | 1.7 | 1 |
| Hon. Tomson Ong | Judge |
Superior Court
| Los Angeles | | 8.0 | 8 |
| Hon. Rafael Ongkeko | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. James Oppliger | Judge |
Superior Court
| Fresno | | 3.3 | 1 |
| Hon. Charlotte Orcutt | Judge |
Superior Court
| San Joaquin | | | 0 |
| Hon. Adrienne Orfield | Judge |
Superior Court
| San Diego | | | 0 |
| Hon. Michael Orfield | Judge |
Superior Court
| San Diego | | 4.6 | 2 |
| Hon. George Orndoff | Judge |
Superior Court
| Kings | | | 0 |
| Hon. Delbert Oros | Judge |
Superior Court
| Sacramento | | 8.2 | 2 |
| Hon. Gary Orozco | Judge |
Superior Court
| Fresno | | 7.2 | 1 |
| Hon. Yolanda Orozco | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Elia Ortiz | Judge |
Superior Court
| Napa | | | 0 |
| Hon. Benny Osorio | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. James Otto | Judge |
Superior Court
| Los Angeles | | | 0 |
| Hon. Carol Overton | Judge |
Superior Court
| Santa Clara | | 6.3 | 1 |
| Hon. Knoel Owen | Judge |
Superior Court
| Sonoma | | | 3 |