Costing from £20,305, the Fastback will go on sale in January with the lead-in model being the SE Nav 1.0 T-GDi 120bhp six-speed manual.
Compared with the others in the i30 line up the Fastback has a roofline that is lowered by an inch-and-a-half giving the car a wider stance, improving aerodynamics and creating a distinctive silhouette, set off with two new alloy wheel designs.
The roofline tapers towards the rear where it meets with an integrated rear spoiler and continues to the rear lights.
At the front, the height of the grille has been reduced for i30 Fastback to emphasise the bonnet. It also features redesigned LED daytime running lights mounted in the new front bumper and headlamps with a dark surround.
The 1.0 T-GDi and 1.4 T-GDi petrol engines are also carried across from the i30 Hatchback and Tourer, with i30 Fastback introducing the 1.0 T-GDi to the Premium and Premium SE trim levels for the first time.
As with the other models the Fastback the level of standard safety equipment with a lane departure warning system, forward collision warning system, lane keep assist, autonomous emergency braking and hill start assist on all models.
Blind spot detection system and rear cross traffic alert are also standard equipment on Premium and Premium SE models.
Tony Whitehorn, president and chief executive of Hyundai Motor UK, said: "The i30 Fastback is the final model of the i30 family to be launched and with it comes a vehicle with its own distinct and unique style.
"The i30 models all share a core family DNA of connected technologies, powertrains and safety equipment, yet each model has its own set of abilities, be it the Hatchback with its family friendly economy and equipment, the Tourer with its mixture of large interior space and powerful yet efficient diesel engines, the N with its total focus on driving fun and now the Fastback with its own charismatic exterior style"