May 15 - Mercury program: NASA launches the last mission of the program, Mercury 9 (on June 12 NASA Administrator James Webb told Congress the program was complete).
October 9 - In northeast Italy, over 2,000 people are killed when the Vaiont Dam breaks after a large landslide behind the dam causes water to overtop it.
November 9 - 1963 Miike coal-mine explosion: In Japan, a coal mine explosion kills 458 and sends 839 carbon monoxide poisoning victims to the hospital.
November 29 - A Douglas DC-8 carrying Trans-Canada Airlines Flight 831 crashes into a wooded hillside after taking-off from Dorval Airport near Montreal, killing all 118 on board (for many years this was the worst air disaster in Canada's history).
May 15 - First television pictures transmitted from a U.S. manned space capsule ("Faith 7.") Due to the poor picture quality, only NBC carries the transmission, and on tape-delay, not live
September 2 ? CBS becomes first network to expand its evening network news from 15 to 30 minutes.
September 9 - NBC expands its evening network news program to 30 minutes
November 22 - regular television programming is suspended following news of John F. Kennedy's assassination