Heroin with a street value of almost £15,000 was recovered by police last week at an address in Portlethen, along with cocaine and diazepam.
Cannabis resin was also recovered by Police Scotland who arrested two men aged 40 and 29 along with two women aged 29 and 24.
The arrests were made as part of a wider investigation in the Aberdeen area which saw police officers recover almost £60,000 worth of drugs and arrest 22-people.
Chief Inspector George MacDonald, of Police Scotland, said: “These are significant results and clearly show that our crack down on those people involved in drugs and violence in our communities will never stop.
“A crucial part of our work in locking these people up is the willingness of our communities across Aberdeen in identifying those causing harm and misery.
‘‘There will be no let-up in our campaign against these individuals and, together with the public and our partner agencies, we will continue to disrupt their criminal behaviour.”
Since its inception in October 2010, Operation Maple has seen more than £1.3 million of controlled drugs seized and over 650 people arrested.
Operation Maple also involves partnership work with Aberdeen City Council, NHS Grampian, the Scottish Government and the Scottish Fire and Rescue Service.