The Ferrari FXX-K is a high performance limited production track day car manufactured by automobile manufacturer Ferrari in Maranello, Italy. Designed by Marco Fainello, Adrián Méndez and architect Samuel Rodriguez at Centro Stile Ferrari, the FXX-K is based on the street-legal LaFerrari. It succeeds Ferrari's previous developmental track day offerings, the FXX (and the FXX Evo) and the 599XX (along with the 599XX Evo). In 2016, the FXX-K was awarded the Compasso d'Oro industrial design award.

The "FXX-K" is Ferrari's research and development vehicle based on the brand's first hybrid sports car, the LaFerrari. The K in the new car's name refers to the kinetic energy recovery system (KERS) which is used to maximize performance. The FXX-K is not intended to be used in competition and was developed to give an uncompromising experience to the driver.

The FXX-K was unveiled at the Yas Marina Circuit in late 2014.

The hybrid powerplant used in the FXX-K has a total power output of 1,050 PS (772 kW; 1,036 hp) and over 900 N⋅m (664 lb⋅ft), of which 860 PS (633 kW; 848 hp) are delivered by the V12 ICE and 190 PS (140 kW; 187 hp) by the electric motor. The V12 engine has been tuned for track use as well as the HY-KERS system. With a dry weight of 1,165 kg (2,568 lb), the FXX-K has extremely effective downforce generation of 540 kg (1,190 lb) at 200 km/h (124 mph).The car has four driving modes: Qualify (maximum performance on short distance), Long Run (for long-distance driving), Fast Charge (for faster recharging of the battery) and Manual Boost, that uses all of the power of the engine and batteries for maximum torque, cornering and speed. It has F1-based technology, including the E-Diff electronic differential, F1-Trac traction control and racing ABS brakes, all controlled from the centre console (Manettino). Like the preceding FXX and 599XX, the FXX-K is a part of Ferrari's Client Test Driver program, that allows owners of XX cars to drive at special tracks, collecting data for use in future Ferrari road and race cars. The front of the car has a large splitter and twin-profile spoiler, the headlights are very small for improving aerodynamics. On the rear, the tail is higher and includes an electronically operated spoiler with a tail fin and a small wing at the end of each fin to maximize the downforce. The car has a top speed of 350 km/h (217 mph).

Torque:                                        750 Nm @ 6500 rpm.553.17 lb.-ft. @ 6500 rpm.

Engine:                                        location Rear, Longitudinal

Transmission:                              7-speed dual-clutch

Length:                                        4,896 mm (192.8 in)

Width:                                          2,051 mm (80.7 in)

Curb weight:                                1,495 kg (3,296 lb) with fluids 1,165 kg (2,568 lb) dry