- Ubaldi, Carlo (c1780-)
- Ubben, Arnd Dieter (1954-)
- Ubéda, José Mariá (1839-1909)
- Überlée, Adalbert (1837-1897)
- Udbye, Martin Andreas (1820-1889)
- Udell, Budd (1934-)
- Uehlein, Christopher Moritz (1931-)
- Ueno, Ken (1970-)
- Uffoltz, Paul Charles François (1833-1917)
- Ugarte, Alphonso de (1879-1939)
- Ugarte, José María de
- Ugartechea Urquieta, Francisco María (1888-1975)
- Ugland, Johan Varen (1946-)
- Uhe, Arthur Emil (1892-)
- Uhl, Alfred (1909-1992)
- Uhl, Danny John (1948-)
- Uhl, Edmund (1853-)
- Uhl, Felix (1813-)
- Uhl, Siegfried (1930-)
- Uibo, Andres (1956-)
- Uitbeijerse, Arjen P. (1975-)
- Uklik, Tomislav (1956-)
- Ukmar, Vilko (1905-1991)
- Uldall, Hans (1903-1983)
- Ulrich, E. J.
- Ultan, Lloyd (1929-1998)
- Ulrich, Marjorie Thelma (1901-)
- Umbreit, Karl Gottlieb (1763-1829)
- Umlauf, S. C.
- Unbehaun, Gustav (1845-1925)
- Underwood, Arthur G.
- Underwood, George C.
- Underwood, Philip (1957-)
- Underwood, Samuel William (1881-)
- Unger, Anders (1948-)
- Unger, Dr Gustave Hermann (1886-1958)
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- Ungerer, Alfred
- Ungerer, Jacques C.
- Ungvary, Tamas (1936-)
- Unkel, Rolf (1912-)
- Unland, Leo (1903-1981)
- Unruh, E.
- Unterhofer, Heinrich (1958-)
- Uppington, Francis Walter Alexander (1899-)
- Uppström, Tore (1936-)
- Upsher, William Tarlton (1877-)
- Upson, E. Denty
- Upton, William Treat (1870-)
- Urbancic, Victor (1903-1958)
- Urbanner, Erich (1936-)
- Ure, John G. (c1851-)
- Urhan, Chrétien (1790-1845)
- Urner, Catherine Murphy (1891-1942)
- Urness, David E.
- Urrestarazu, José
- Urros, Joseph de (c1670-)
- Urrows, David Francis (1957-)
- Urroz, Joseph de (c1670-)
- Urspruch, Anton (1850-1907)
- Urteaga-Iturrioz, Luis (1882-1960)
- Urwin, Ray W. (1950-)
- Usandizaga, José Maria (1887-1915)
- Uspensky, Vladislav Alexandrovich (Владислав Александрович) (1937-)
- Usper, Francesco (c1570-1641)
- Ustariz, Rafael (1754-1802)
- Uttenveiller, Martin
- Utterback, Dr Joe (1944-)
- Utting, Craig (1965-)
- Utz, Hermann Kurt (1901-1974)
- Uy, Paul (1932-)
- Uyttenhove, Yolande (1925-2000)
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Organist 
Organist & composer 
Composer 
Organ builder 
Other
