U
Bold indicates Hall of Famer.
*Indicates active as of 2008.
| Jimmy Uchrinscko | 1926-1926 |
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| Bob Uecker | 1962-1967 |
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| Dan Uggla* | 2006-2008 |
| Luis Ugueto | 2002-2003 |
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| Frenchy Uhalt | 1934-1934 |
| Ted Uhlaender | 1965-1972 |
| Bob Uhl | 1938-1940 |
| George Uhle | 1919-1936 |
| Maury Uhler | 1914-1914 |
| Charlie Uhlir | 1934-1934 |
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| Jerry Ujdur | 1980-1984 |
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| Mike Ulisney | 1945-1945 |
| Scott Ullger | 1983-1983 |
| Sandy Ullrich | 1944-1945 |
| Dutch Ulrich | 1925-1927 |
| George Ulrich | 1892-1896 |
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| Arnold Umbach | 1964-1966 |
| Jim Umbarger | 1975-1978 |
| Jim Umbricht | 1959-1963 |
| Tom Umphlett | 1953-1955 |
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| Fred Underwood | 1894-1894 |
| Pat Underwood | 1979-1983 |
| Tom Underwood | 1974-1984 |
| Willie Underhill | 1927-1928 |
| Bob Unglaub | 1904-1910 |
| Tim Unroe | 1995-2000 |
| Al Unser | 1942-1945 |
| Del Unser | 1968-1982 |
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| Woody Upchurch | 1935-1936 |
| Bill Upham | 1915-1918 |
| John Upham | 1967-1968 |
| Jerry Upp | 1909-1909 |
| Dixie Upright | 1953-1953 |
| Cecil Upshaw | 1966-1975 |
| Willie Upshaw | 1978-1988 |
| Bill Upton | 1954-1954 |
| B.J. Upton* | 2004-2008 |
| Justin Upton* | 2007-2008 |
| Tom Upton | 1950-1952 |
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| Billy Urbanski | 1931-1937 |
| Jack Urban | 1957-1959 |
| Luke Urban | 1927-1928 |
| Tom Urbani | 1993-1996 |
| Ugueth Urbina | 1995-2005 |
| Lino Urdaneta | 2004-2007 |
| Jose Uribe | 1984-1993 |
| Juan Uribe* | 2001-2008 |
| John Urrea | 1977-1981 |
| Lon Ury | 1903-1903 |
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| Bob Usher | 1946-1957 |
| Dutch Ussat | 1925-1927 |
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| Chase Utley* | 2003-2008 |
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