deKieffer (November 8, 1945 - February 18, 2011) was an American lawyer.
He was the co-founder of deKieffer & Horgan, a Washington, D.C.-based international law firm, and the president of EDDI Inc., an anticounterfeiting and antidiversion company.
In the 1970s, he acted as a lobbyist for the South African apartheid regime.