The first inauguration of Lyndon B. Johnson as the 36th president of the United States was held on Friday, November 22, 1963, aboard Air Force One at Dallas Love Field, following the assassination of President John F. Kennedy earlier that day. The inauguration – the eighth non-scheduled, extraordinary inauguration to ever take place – marked the commencement of the first term of Lyndon B. Johnson as president.

On November 22, 1963, John F. Kennedy, the 35th president of the United States, was assassinated while riding in a presidential motorcade through Dealey Plaza in Dallas, Texas. Kennedy was in the vehicle with his wife, Jacqueline, Texas Governor John Connally, and Connally's wife, Nellie, when he was fatally shot from the nearby Texas School Book Depository by former U.S. Marine Lee Harvey Oswald. The motorcade rushed to Parkland Memorial Hospital, where Kennedy was pronounced dead about 30 minutes after the shooting; Connally was also wounded in the attack but recovered. Vice President Lyndon B. Johnson was hastily sworn in as president two hours and eight minutes later aboard Air Force One at Dallas Love Field.