SS-100-X is the U.S. Secret Service code name for the Presidential limousine used by the 35th President of the United States, John F. Kennedy. The limousine is the one that Kennedy and First Lady Jacqueline Kennedy were riding in when the President was assassinated in Dealey Plaza in Dallas, Texas on November 22, 1963.

The car is a 1961 Lincoln Continental four door convertible with "suicide doors"  and a retail price of $7,347. It was painted a special midnight blue color and modified to Secret Service specifications by Ford Motor Company's Advanced Vehicles Group, and Hess & Eisenhardt of Cincinnati, Ohio. Together, these two companies created one of the most modern open parade limousines of its day. The limousine was presented to the White House in March 1961, after modifications that cost the United States government approximately $200,000.