This is a list of aviation-related events from 1956.
The deadliest crash of this year was the 1956 Grand Canyon mid-air collision of 30 June, when a United Airlines Douglas DC-7 collided with a TWA Lockheed L-1049 Super Constellation over the Grand Canyon, Arizona, U.S., killing all 128 people aboard both aircraft. At the time, this was the deadliest accident in civil aviation history. It is also the deadliest civil aviation crash of the 1950s decade; the 1953 Tachikawa air disaster had killed 129 people but involved a military aircraft. The deadliest single-aircraft accident was Linea Aeropostal Venezolana Flight 253, a Lockheed L-1049 Super Constellation which crashed into the Atlantic Ocean off New Jersey, U.S. on 20 June, killing all 74 people on board.