Diehl may refer to:
People Diehl (surname), a German surname
Given name Diehl Mateer (1928–2012), American squash player
Companies Diehl Aerospace GmbH, a German aerospace company Diehl Defence GmbH & Co. KG, a German arms manufacturer Diehl Film, German filmmaking business (c. 1937–1970) Diehl Metall Stiftung & Co. KG, a German metal processing company House of Diehl, a New York–based fashion partnership Diehl (company), a german corporate group headquartered in Nuremberg
Military Diehl DM-41, a military projectile USNS Walter S. Diehl (T-AO-193), a U.S. Navy fleet replenishment oiler in service since 1988
See also Diehls Covered Bridge, in Bedford County, Pennsylvania George Diehl Homestead, in Cherryhill Township, Indiana County, Pennsylvania Oscar C. Diehl House, in Midland, Michigan