Henderikus "Pim" Sierks (born 10 March 1932) is a former airline pilot who most notably captained a Boeing 707 full of hostages and hostage takers during the 1974 French Embassy attack in The Hague. He was a member of the Royal Netherlands Air Force for over 11 years and had flown many Dutch fighter jets. Upon retirement from the Air Force he worked as an airline pilot for Dutch airline Transavia.