Renault claims the Mégane is the most fuel-efficient car in its class.
New Mégane has undergone a number of changes, refreshing the range for 2013.
New styling sees the front end with a more modern feel, while LED daytime running lights provide a distinctive new lighting signature.
The bumper features a gloss black finish with chrome highlights, and the selection of wheels has been revised.
New Mégane is the first Renault model to be available with the two new Stop & Start engines, which Renault says combine both motoring enjoyment and fuel efficiency.
They are the fruit of new-generation downsizing and call on Renault's experience in F1 to form unprecedented technology packages for this level of range, including Stop & Start complete with deceleration and braking energy recovery.
Thanks to their carefully-tuned acoustics, these engines produce a discreet, cushioned sound, with noise levels halved compared with the engines they replace.
Julien Lelorrain, Marketing Director, Renault Ireland, said: "New Mégane is amongst the newest cars introduced in this segment on the Irish market.
"New Mégane is even more refined with its stylish front and economical engines and is now even more affordable thanks to our ReFlex offer from €189 per month.
"We are delighted to bring further peace of mind to our customers in protecting the prices of our range of cars against any eventual tax increase in the budget when you place your order before the 31st December.
"This means our customers know exactly what they will have to pay when they collect their car 2013; we are the first manufacturer to offer such a scheme."
The new Renault Mégane Hatch, Coupé and Grand Mégane are available to test drive now from €189 per month on the ReFlex personal contract plan with Renault Finance.
Prices for Mégane start at €18,990.