e.h. Bernhard Plettner (December 2, 1914 in Oberlahnstein – November 2, 1997 in Erlangen) was a German engineer and manager.
Plettner studied electrical engineering in Darmstadt.
After World War II Plettner was especially engaged in restoring the export relations of the firm.
Plettner became a member of the board of directors of Siemens-Schuckertwerke in 1959 and CEO of this company in 1962.
When he was succeeded by Karlheinz Kaske in 1981, Plettner became the first chairman of the supervisory board not to be a member of the Siemens family.