UB4 may refer to
* UB4, a postcode district in the
UB postcode area
The UB postcode area, also known as the Southall postcode area,Royal Mail, ''Address Management Guide'', (2004) is a group of eleven postcode districts in England, within six post towns. These cover parts of western and north-western Greater Lond ...
*
SM ''UB-4'', a World War I German submarine
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