Ferranti or Ferranti International plc was a major UK electrical engineering and equipment firm known primarily for defence electronics and power grid systems. The Company was once a constituent of the FTSE 100 Index but ceased trading in 1993.

Ferranti is also famous in the computer industry for building the first commercially available computer, the Ferranti Mark 1, which was first delivered in 1951 and started their computer business, which lasted into the 1970s. They had influential collaborations with the university computing departments at Manchester and Cambridge, which resulted in the development of the Mercury and Atlas machines (Manchester); and the Atlas 2 or Titan (Cambridge).