They range in age from 17 to 45 years.
A cannabis grow house was discovered in the North inner city, with over 800 plants in various stages of growth valued at 640,000 euro were found.
Four people were arrested at the scene.
Searches were also carried out at locations in County Wexford where five further arrests were made as part of the investigation.
A total of nine people are currently detained at Garda Stations in Dublin & Wexford by investigating Gardaí.
Those arrested include six Portuguese nationals all men, one UK national a man, and a man and woman from Ireland.