British European Airways Flight 548 was a scheduled passenger flight from London Heathrow to Brussels that crashed near Staines, Middlesex, England, soon after take-off on 18 June 1972, killing all 118 people on board. The accident became known as the Staines air disaster. As of 2021, it remains the deadliest air accident (as opposed to terrorist incidents) in the United Kingdom and was the deadliest air accident involving a Hawker Siddeley Trident. Two passengers initially survived the impact but soon after died from their injuries.

The aircraft suffered a deep stall in the third minute of its flight and crashed to the ground, narrowly missing a busy main road. The public inquiry principally blamed the captain for failing to maintain airspeed and configure the high-lift devices correctly. It also cited the captain's heart condition and the limited experience of the co-pilot, while noting an unspecified "technical problem" that the crew apparently resolved before take-off.

The crash took place against the background of a pilots' strike that had caused bad feelings between crew members. The strike had also disrupted services, causing Flight 548 to be loaded with the maximum weight allowable. Recommendations from the inquiry led to the mandatory installation of cockpit voice recorders in British-registered airliners. Another recommendation was for greater caution before allowing off-duty crew members to occupy flight deck seats. Some observers felt that the inquiry was unduly biased in favour of the aircraft's manufacturers.