U27
U27 may refer to:

Naval vessels 
 
 , various vessels
 , a sloop of the Royal Navy
 U-27-class submarine (Austria-Hungary) of the Austro-Hungarian Navy
 , the lead boat of the class

Other uses 
 Cessna U-27 Caravan, an American utility aircraft
 Rhombicosidodecahedron
 Small nucleolar RNA SNORD27