Uceta, Edwin
Uchrinscko, Jimmy
Uecker, Bob
Uehara, Koji (playoffs)
Uelmen, Erich
Uggla, Dan (playoffs)
Ugueto, Luis
Uhalt, Frenchy
Uhl, Bob
Uhlaender, Ted (playoffs)
Uhle, George (playoffs)
Uhler, Maury
Uhlir, Charlie
Ujdur, Jerry
Ulicny, Mike
Ullger, Scott
Ullrich, Sandy
Ulrich, Dutch
Umbach, Arnold
Umbarger, Jim
Umbricht, Jim
Umphlett, Tom
Underhill, Vern
Underwood, Duane
Underwood, Pat
Underwood, Tom (playoffs)
Unroe, Tim
Unser, Al
Unser, Del (playoffs)
Upchurch, Woody
Upham, Bill
Upham, John
Upright, Dixie
Upshaw, Cecil (playoffs)
Upshaw, Willie (playoffs)
Upton, Bill
Upton, Justin (playoffs)
Upton, Melvin (playoffs)
Upton, Tom
Urban, Jack
Urban, Luke
Urbani, Tom
Urbanski, Billy
Urbina, Ugueth (playoffs)
Urdaneta, Lino
Urena, Jose
Urena, Richard
Urias, Julio (playoffs)
Urias, Luis (playoffs)
Urias, Ramon (playoffs)
Uribe, Abner (playoffs)
Uribe, Jose (playoffs)
Uribe, Juan (playoffs)
Urquidy, Jose (playoffs)
Urrea, John
Urrutia, Henry
Urshela, Giovanny (playoffs)
Usher, Bob
Ussat, Dutch
Utley, Chase (playoffs)
Uwasawa, Naoyuki