The arrests took place at addresses throughout the city of Derry.
Two men, aged 31 and 20, were arrested on suspicion of supplying a Class B drug following a search of a house in the Bogside area.
A 41-year-old man was detained after police found suspected Class B drugs during a search in the Waterside area of the city.
A 34-year-old man was arrested for possessing a Class B drug in the Edenballymore area.
Three men, aged 39, 41 and 17, were arrested on suspicion of possessing a Class B drug with intent to supply after a car was stopped at Beechwood Crescent.
A 24-year-old man was detained on suspicion of possessing illegal drugs following a house search at Northland Road.
A 39-year-old man was arrested on suspicion of possessing a Class B drug following a house search at John Street.
And a 26-year-old man was arrested on suspicion of possessing a Class B drug in the Moss Park area.
The 41-year-old detained at Beechwood Crescent was remanded in custody and the 24-year-old released on bail when they appeared separately at Derry Magistrates Court.
The remaining eight were released on police bail pending further enquiries.