| Jesse A. Udall | Ariz. | 1960–1972 |
| Levi S. Udall | Ariz. | 1947–1960 |
| Antony Christopher Ufland | Superior Court of California, County of Orange | 2017– |
| Henry L. Ughetta | N.Y. App. Div. | 1955–1967 |
| Harvey Uhlenhopp | Iowa | 1970–1986 |
| Ingrid Adamson Uhler | Superior Court of California, County of San Bernardino | 1998– |
| Stephen L Ukeiley | Suffolk County District Court | – |
| Heidi Ulbricht | Eleventh Judicial District Court | – |
| Eric R. Uldall | Superior Court of California, County of Solano | 1998–2002 |
| Cynthia Leigh Ulfig | Superior Court of California, County of Los Angeles | 2000– |
| Michael S. Ullman | Superior Court of California, County of Sacramento | 1998–2003 |
| Juan Ulloa | Superior Court of California, County of Imperial | 1995–2003 |
| Randall T. Ullom | Fairfield County Municipal Court | – |
| Richard Brownley Ulmer Jr. | Superior Court of California, County of San Francisco | 2009– |
| Robert Ulrich | Mo. Ct. App. | 1998–2010 |
| Charles Joe Umeda | Superior Court of California, County of San Bernardino | 2015– |
| Donald G. Umhofer | Superior Court of California, County of San Luis Obispo | 1998–2003 |
| Hiram K. Undercofler | Ga. | 1967–1981 |
| Stefan R. Underhill | D. Connecticut | 1999– |
| Emory Marvin Underwood | N.D. Georgia | 1931–1960 |
| Gerald V. Underwood | Superior Court of California, County of Stanislaus | 1968–1988 |
| Harold Underwood | Superior Court of California, County of Trinity | 1958–1983 |
| John Curtiss Underwood | E.D. Virginia | 1864–1873 |
| Mell Gilbert Underwood | S.D. Ohio | 1936–1972 |
| Norman L. Underwood | Ga. Ct. App. | 1979–1979 |
| Robert C. Underwood | Ill. | 1962–1984 |
| Wynn Underwood | Vt. | 1981–1984 |
| Ursula Ungaro | S.D. Florida | 1992–2021 |
| Cynda Riggins Unger | Superior Court of California, County of Solano | 2001–2018 |
| Hilary D. Unger | Texas 248th District Court | – |
| Richard Unis | Or. | 1990–1996 |
| Sandra Unsworth | Second Judicial District Court | – |
| Green Wix Unthank | E.D. Kentucky | 1980–2013 |
| Frank Upchurch Jr. | Fla. Dist. Ct. App. | 1979–1988 |
| John Upchurch | Fla. Dist. Ct. App. | 1976–1983 |
| Carlos A. Uranga | Superior Court of California, County of Los Angeles | 2000–2014 |
| Michael Francis Urbanski | W.D. Virginia | 2011– |
| Walter C. Urbigkit | Wyo. | 1985–1993 |
| Ricardo M. Urbina | D.D.C. | 1994–2012 |
| Ricardo M. Urbina | D.C. | 1994–2012 |
| Warren Keith Urbom | D. Nebraska | 1970–2017 |
| Patrick J. Urda | Tax Ct. | 2018– |
| Jane Ure | Superior Court of California, County of Sacramento | 1998–2008 |
| David Herrera Urias | D. New Mexico | 2022– |
| Phillip R. Urie | Superior Court of California, County of San Joaquin | 2009–2019 |
| Mark Andrew Urioste | Superior Court of California, County of Sonoma | 2019– |
| Bradley G. Urrutia | Texas 450th District Court | – |
| Pamela Tamu Usher | Superior Court of California, County of Los Angeles | 2017– |
| Kathleen M. Uston | Alexandria Circuit Court | – |
| Thomas S Utschig | Bankr. W.D. Wisconsin | 1986–2013 |
| Robert F. Utter | Wash. | 1971–1995 |
| Hubert Utterback | Iowa | 1932–1933 |
| Jessica Adriana Uzcategui | Superior Court of California, County of Los Angeles | 2018– |