German submarine U-28

U 28 stands for:

Several submarines:

• SM U 28, U - boat of the Imperial Navy ( 1914-1917 )
• U 28 ( Navy ) ( 1936-1944 )
• U 28 (Bundeswehr) ( 1974-2004 )
• SM U 28 ( Austria - Hungary) ( 1915-1917 )

As well as

• U -28A, special aircraft for the U.S. Air Force, see Pilatus PC -12

• Disambiguation
• Abbreviation