The new flavour, available from September 18, has been designed to capitalise on the growing number of consumers who are buying dark chocolate.
The company has also repackaged its entire KitKat range in 'foil fresh' packaging which, it claims, keeps the product fresher for five times longer.
The new packaging will be used on KitKat four-finger, two-finger and KitKat Chunky. It echoes the old foil wrap and band packaging but is, in fact, a metallised wrapper.
The company is also increasing the percentage of chocolate on each bar from September.
Marketing for the new packaging and KitKat Dark will include a £5m advertising campaign.
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