| UNECAR | TRICICLO | REINO UNIDO | MAIDSTONE - KENT | 1909 |
| UNIBUS | ESCÚTER | REINO UNIDO | CHELTENHAM - GLOUCESTERSHIRE | 1917-1920 |
| UNICAR | TRICAR | REINO UNIDO | BOREHAMWOOD - HERTFORDSHIRE | 1945-1956 |
| UNIMOTO | MOTOCICLETA | ITALIA | CESENA - LONGIANO - FORLÌ-CESENA | 1980 |
| UNION (Charlottenberg) | MOTOCICLETA | SUECIA | CHARLOTTENBERG-EDA - VÄRMLAND | 1950 |
| UNION (Stockholm) | CICLOMOTOR | SUECIA | STOCKHOLM - STOCKHOLM LÄN | 1955 |
| UNION (Willenhall) | MOTOR | REINO UNIDO | WILLENHALL - STAFFORDSHIRE | 1912 |
| UNION HOLLAND | CICLOMOTOR | PAISES BAJOS | NIEUWLEUSEN - VARSSEVELD - OVERIJSSEL - GELDERLAND | 1904 |
| UNIVERSAL (Willisau) | MOTOCICLETA | SUIZA | WILLISAU - LUZERN | 1928 |
| UNIVERSELLE | MOTOCICLETA | ALEMANIA (REP. WEIMAR) | DRESDEN - SACHSEN | 1925 |
| URAL - IMZ | MOTOCICLETA | URSS | IRBIT - SVERDLOVSK | 1939 |
| URBAN JET | TRICAR | USA | NEWARK - DELAWARE | 2010 |
| URS | SIDECAR | ALEMANIA | URSENBACH - BADEN-WÜRTTEMBERG | 1966 |
| UT | MOTOCICLETA | ALEMANIA (REP. WEIMAR) | STUTTGART - WÜRTTEMBERG - BADEN-WÜRTTEMBERG | 1922 |
| UTILIA | MOTOCICLETA | FRANCIA | PARIS - SEINE | 1929 |
| UTOPIAN | TRICICLO | REINO UNIDO | LEICESTER - LEICESTERSHIRE | 1914 |
| VACANCES | CICLOMOTOR | FRANCIA | SAINT-ÉTIENNE - LOIRE | 1954 |
| VAGA | MOTOCICLETA | ITALIA | MILANO - MILANO | 1925 |
| VAGHI | TRICAR | ITALIA | MILANO - MILANO | 1920 |
| VAGIRO | MOTOCARRO | ARGENTINA | BUENOS AIRES - BUENOS AIRES | 1959 |