Karlheinz Schreiber (born March 25, 1934 in Petersdorf (Thüringen)) is a German and Canadian citizen, an industrialist, lobbyist, fundraiser, arms dealer and businessman. He has been in the news regarding his alleged role in the 1999 CDU contributions scandal in Germany, which damaged the political legacy of former Chancellor of Germany Helmut Kohl, and the Airbus affair in Canada, which was linked through allegation to former Prime Minister of Canada Brian Mulroney.

Schreiber began his career working for the Bundesnachrichtendienst (BND) or West German intelligence service. After leaving the agency he became an international arms dealer, lobbyist, and deal maker. He was a fundraiser for the Christian Democratic Union (CDU) and Christian Social Union in West Germany before and during Helmut Kohl's chancellorship.

Schreiber stated in his Canadian House of Commons testimony on November 29, 2007 that he had in fact been a judge for nine years in Germany.