| Name | Title | Court | Judicial District | County | Rate this Judge | Rating | # of Ratings |
| Hon. Paul Macek | Judge |
District Court
| District 7 | Scott |  | 2.4 | 1 |
| Hon. James Malloy | Judge |
District Court
| District 2 | Story | | | 0 |
| Hon. Edward Mansfield | Justice |
Supreme Court
| | None | | | 0 |
| Hon. David May | Judge |
District Court
| District 5 | Polk | | | 0 |
| Hon. Brad McCall | Judge |
District Court
| District 8 | Poweshiek | | | 0 |
| Hon. Christopher McDonald | Judge |
Court of Appeals
| | None | | | 0 |
| Hon. Christopher McDonald | Judge |
District Court
| District 5 | Polk | | | 0 |
| Hon. Odell McGhee, II | Judge |
District Court
| District 5 | Polk | | | 0 |
| Hon. James McGlynn | Judge |
District Court
| District 2 | Hamilton | | | 0 |
| Hon. Kevin McKeever | Judge |
District Court
| District 6 | Iowa | | | 0 |
| Hon. Gary McKenrick | Judge |
District Court
| District 7 | Clinton | | 1.0 | 1 |
| Hon. Lawrence McLellan | Judge |
District Court
| District 5 | Polk | | | 0 |
| Hon. Gary McMinimee | Judge |
District Court
| District 2 | Boone | | | 0 |
| Hon. Sean McPartland | Judge |
District Court
| District 6 | Linn | | | 0 |
| Hon. Rose Anne Mefford | Judge |
District Court
| District 8 | Mahaska | | | 0 |
| Hon. Martha Mertz | Judge |
District Court
| District 5 | Marion | | | 0 |
| Hon. Paul Miller | Judge |
District Court
| District 6 | Johnson | | 6.4 | 1 |
| Hon. Deborah Farmer Minot | Judge |
District Court
| District 6 | Johnson | | 1.3 | 1 |
| Hon. Cynthia Moisan | Judge |
District Court
| District 5 | Polk | | | 0 |
| Hon. Michael Moon | Judge |
District Court
| District 2 | Boone | | | 0 |
| Hon. Joseph Moothart | Associate Judge |
District Court
| District 1 | Black Hawk | | | 0 |
| Hon. Michael Mullins | Judge |
Court of Appeals
| | None | | | 0 |