Holywood-based company IAS Smarts claimed the top accolade in the annual Northern Ireland Chartered Institute of Public Relations PRide Awards.
IAS Smarts was named consultancy PR team of the year at the awards gala in Belfast's Europa Hotel ? and won three gold awards and three silver in total.
Its gold awards also included best corporate communications campaign for its work with soft services company resource and best use of photography or design for its Voypic, Do You Care? initiative.
JPR, which is based in east Belfast, picked up four gold awards and two silver, with its George Best £5 note campaign taking two of the golds, for best use of media relations and best consumer relations.
The young communicator of the year award went to Julie Kane of The PR Agency in the south of the city, while the Northern Ireland Commission for Children & Young People was awarded the best in-house PR team accolade for the second year running and picked up a gold award for best publication.
Jennifer Maguire, chair of CIPR Northern Ireland, said: "The PRide Awards showcase the excellent PR work being done in Northern Ireland and the contribution this makes to business and society."
Belfast company AndersonSprattGroup PR won two gold awards: the internal communications gong for its work with Youth Justice Agency and the prize for best community relations campaign for its work with Glen Water on Delivering A Cleaner Coastline.
Navigator Blue, also based in Belfast, won a gold award for The Fate Awards 2007 and a silver for its launch of The Outlet.
Meanwhile, the gold award for corporate social responsibility went to Joe Braden of JMB03 for SuperValu Gets Action Cancer Big Bus Moving.