Officers stopped a Polish registered truck which came on a ferry from France and found the cigarettes within its load.
They have a retail value of €2.4 million, which is a potential loss to the exchequer of over 1.8 million.
A man in his 40s is being questioned as part of the investigation.
Peter Thiel Event Will Not Go Ahead In Wicklow Hotel
Powerscourt Estate, where the five-star Powerscourt Hotel and Spa is located, announced the Dialog event has been cancelled - with relief.
Wicklow Receives €10.72 Million to Repair Roads Damaged by Storm Chandra
Wicklow Apprentice Wins ESB HGV Mechanic Apprentice of the Year
A wheely good result for Daniel Diamond from Glenealy!
Wicklow Takes Two Spots In Top Five As Ireland's Best Music Festivals Are Revealed
Beyond the Pale and Kaleidoscope wow the crowds with festival fever flair finishing top five in nationwide research
Short-Term Extension Of Fuel Excise Cuts For Wicklow Families And Businesses
Tanaiste says extending measures is to offset 'cliff-edge' fall for people and businesses while monitoring inflation
6:00am - 8:00am
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High: 23°C | Low: 13°C
Medium-level cloud
High: 21°C | Low: 13°C
Medium-level cloud
High: 23°C | Low: 13°C