Abstract: The invention relates to an anti-crash seat with harness for an aircraft.The seat is mounted with limited sliding on at least one substantially vertical support (8), integral with the structure of said aircraft and associated with at least one energy-absorbing device (12), located between said seat and said structure. Advantageously:it is shaped as a bench (2) defining a plurality of seating spaces which are located side by side and each of which is equipped with a safety harness (6);it includes at least one additional energy-absorbing device (16), situated between said structure of the aircraft and a coupling mechanism (17) with locking provided at least at one of said seating spaces; andsaid mechanism (17) for coupling between said bench and said additional device is controlled by the harness (6) associated with said seating space.