The HST features a 3.0-litre supercharged V6 engine, unique chassis settings and enhanced design features.
A range of updates to the 2016 MY Range Rover Sport line-up will also be showcased in New York, including the availability of a new Gesture Tailgate and the introduction of Automatic Access Height.
David Mitchell, Vehicle Programme Director Range Rover Sport, said: "The HST extends our Range Rover Sport line-up giving customers even greater choice. Sitting between the existing 340PS Range Rover Sport 3.0-litre V6 supercharged and the 550PS supercharged variant, it delivers enhanced V6 performance to go with Range Rover Sport's renowned comfort and refinement."
With today's Range Rover Sport announcement, the 2015 New York Auto Show is set to host the largest number of world and North American debuts in its 115-year history. Last year, 63 vehicles from the world's automakers were unveiled.
The Auto Show runs from April 3 - 12 at the Jacob K. Javits Convention Center in Manhattan.
