| Author | Titles | | 1.
| Urech, Édouard | 2 | | 2.
| Urena Portero, Gabriel | 1 | | 3.
| Uresová, Libuse | 1 | | 4.
| Urgeghe, Luca | 1 | | 5.
| Urgell, Modest, 1839-1919 | 1 | | 6.
| Uri, Isaac | 2 | | 7.
| Uriach i Marsal, Joan | 1 | | 8.
| Uriarte, Jesús | 2 | | 9.
| Uribe Echeverría, Armando, 1960- | 3 | | 10.
| Uribe, Kirmen | 1 |
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