| Opus | Author | School | Born-died |
 | UDEN, Lucas van | Flemish | (b. 1595, Antwerpen, d. 1672, Antwerpen) |
 | ULFT, Jacob van der | Dutch | (b. 1627, Gorinchem, d. 1689, Nordwijk) |
 | UNKNOWN MASTER, Austrian | Austrian | (active around 1400) |
 | UNKNOWN MASTER, Bohemian | Bohemian | (first quarter of the 15th century) |
 | UNKNOWN MASTER, Dutch | Dutch | (active in the 1620s in Leiden) |
 | UNKNOWN MASTER, English | English | (active 1530s) |
 | UNKNOWN MASTER, Flemish | Flemish | (last quarter of the 15th century) |
 | UNKNOWN MASTER, French | French | (14th century) |
 | UNKNOWN MASTER, German | German | (active in 1420s in the Middle Rhineland) |
 | UNKNOWN MASTER, Hungarian | Hungarian | (active around 1490) |
 | UNKNOWN MASTER, Italian | Italian | (15th century, Siena) |
 | UNKNOWN MASTER, Russian | Russian | (16th century) |
 | UNKNOWN MASTER, Spanish | Spanish | (second half of 15th century) |
 | UNTERBERGER, Michelangelo | Austrian | (b. 1695, Cavalese, d. 1758, Wien) |
 | UTRECHT, Adriaen van | Flemish | (b. 1599, Antwerpen, d. 1652, Antwerpen) |
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