The Lamborghini Countach LPI 800-4 is a mid-engine hybrid-electric sports car produced by the Italian automotive manufacturer Lamborghini. Unveiled on 14 August 2021, the car is named after the original Countach which was first introduced 50 years prior. Based on the hybridized powertrain of the Sián FKP 37, 112 units are planned to be produced, the number referring to the LP 112 model designation used during development of the original Countach.

The Countach LPI 800-4 shares its underpinnings and mechanicals with the Sián FKP 37 which was unveiled in 2019. It utilizes the same carbon-fiber monocoque along with the same mild hybrid powertrain with a slightly decreased combined output of 599 kW (814 PS; 803 hp) powering all four wheels. It is a combination of the longitudinally positioned (LP) naturally-aspirated 6.5-liter V12 engine which in this case produces 574 kW (780 PS; 770 hp), along with a 48-volt electric motor producing an additional 25 kW (34 PS; 34 hp) which is located inside the 7-speed automated manual transmission.