BBH's strong year, capped by it winning British Airways, made it a clear winner.
BBDO saw off BBH and DDB to clinch the Advertising Network of the Year award. Wins including Bank of America and AOL contributed towards its success.
Dare was named Digital Agency of the Year for the third consecutive year, while PHD won Media Agency of the Year, narrowly defeating the online specialist i-level. OMD took the Media Network of the Year accolade.
Rapier won Direct Agency of the Year, while Stink triumphed as Production Company of the Year.
Channel 4 won both Advertiser of the Year and Medium of the Year, bucking the declining trend in terrestrial TV.
Stella Artois' "reassuringly expensive" campaign by Lowe won Campaign of the Year, while Dove's "campaign for real beauty" by Ogilvy & Mather won it International Advertiser of the Year.
The winners of the awards, sponsored by Vodafone, were announced on Wednesday night at an event held at The Arts Club in Mayfair.