Authors: U
| Author (number of quotes) | Description |
| Ul | |
| Ulam, Stanislaw (1) | Polish-American mathematician |
| Ulmer, Ernestine (1) | |
| Ulrich, Laurel Thatcher (1) | America historian and writer |
| Un | |
| Unamuno, Miguel de (1) | Spanish author, poet, philosopher |
| Us | |
| Ustinov, Peter (3) | English actor, director, author |