U-boat (German: U-Boot) is a German military submarine of World War I and II. U-boat or U-Boot may also refer to: Software Das U-Boot, computer software, a GNU GPL boot loader U-boat (video game), a 1994 video game Uboat (video game), an upcoming submarine simulation video game Transport U-boat, a nickname for the GE Universal Series of diesel locomotives built by General Electric Southern Railway's U and U1 class locomotives, nicknamed "U-boats" U-boat, an Australian class of interurban railcars, otherwise known as U sets U-boat, a nickname for the WAGR U Class steam locomotives built by the North British Locomotive Company in 1942 Other U-Boot (beer cocktail), a cocktail made with vodka and beer "U Boat", a song on the album Kasabian by the band of the same name it:U-boat