| Name | Title | Court | Judicial District | County | Rate this Judge | Rating | # of Ratings |
| Hon. Daniel Patrick O'Brien | Judge |
Circuit
| 6th | Oakland |  | | 0 |
| Hon. Daniel O'Brien | Judge |
Probate
| 6th | Oakland | | | 2 |
| Hon. Darlene O'Brien | Judge |
Probate
| 22nd | Washtenaw | | | 1 |
| Hon. Colleen O'Brien | Judge |
Court of Appeals
| 30th | Ingham | | | 0 |
| Hon. Peter O'Connell | Judge |
Court of Appeals
| 30th | Ingham | | | 0 |
| Hon. Patrick O'Grady | Chief Judge |
District
| 15th | Branch | | | 0 |
| Hon. Jeffery O'Hara | Judge |
District
| 17th | Kent | | | 1 |
| Hon. Julie O'Neill | Judge |
District
| 56th | Eaton | | | 0 |
| Hon. Brian Oakley | Judge |
District
| 3rd | Wayne | | | 0 |
| Hon. Christopher Odette | Judge |
District
| 7th | Genesee | | | 0 |
| Hon. Brigette Officer-Hill | Chief Judge |
District
| 3rd | Wayne | | | 0 |
| Hon. Lisa Ortlieb Gorcyca | Judge |
Circuit
| 6th | Oakland | | | 0 |
| Hon. Joseph Craigen Oster | Judge |
District
| 16th | Macomb | | | 0 |
| Hon. Donald Owens | Judge |
Court of Appeals
| 30th | Ingham | | | 0 |
| Hon. Maria Oxholm | Judge |
Circuit
| 3rd | Wayne | | | 0 |