First customer deliveries will be made in early January 2014.
Prices will start from €21,595 for the SKYACTIV-G Petrol 100hp and from €25,295 for the SKYACTIV-D Diesel 150hp.
Tony Howarth, Managing Director, Mazda Motor Ireland, said: "From a design and performance perspective, the new-generation Mazda3 truly embodies the spirit of Mazda, defying conventional expectations of the C-segment.
"The new-generation Mazda3 offers not only a more powerful and fun drive, but, more importantly, a more economical and safer one."
Mazda3 has enhanced specification levels across models including SE, Executive, Executive SE to the newly introduced GT/Platinum grades.
GT/Platinum specification grades include 18" alloy wheels, surround sound Bose system, nine speakers, heads up display and front and rear parking sensors. Nine exterior colours feature also.