Briefe von Schönberg an U
| Empfänger | Firma |
| U.E. | |
| U.E./Musikverlag Hofmeister | |
| U.S. Consul, Austria | |
| U.S. Consul, France | |
| U.S. Dep of Commerce | |
| U.S. Dep of Justice | |
| U.S. Dep of Labor | |
| U.S. Dep of State | |
| U.S. Government | |
| U.S. Postmaster General | |
| UC | |
| UC Berkeley | |
| UC Regents | |
| UCLA | |
| Ullsteinhaus | |
| Univ of Chicago | |
| Universal Art, Inc | |
| Universal Enterprises | |
| Urania | |
| USC | |
| Ucko, Hans | |
| Underwood, Roy | |
| Unger, Heinz | |
| Unger, Max | |
| Unger, Nell Avery | Lib Assn of Portland |
| Unzeitig, Viktor | |
| Urbach, [?] | |
| Urban, Gretl | Assoc Music Publ |
| Ussher, Bruno David | U.S. WPA |
| Utley, David H. |
