Leonid Vasylovych Derkach (Ukrainian: Леонід Васильович Деркач; 19 July 1939 – 14 January 2022) was a Soviet and Ukrainian politician, intelligence officer, and general who was Head of the Security Service of Ukraine from 22 April 1998 to 10 February 2001. Called the "Ukrainian Sorge" (Russian: "Украинский Зорге"), he headed one of the five groups in the Dnipropetrovsk Mafia. The Derkach family maintains very close relationships with Oleg Deripaska, Mikhail Fridman's Moscow-based Alfa Group and Petr Aven's Alfa-Bank.