The Government agency took home the prizes for both Crisis Communications and the special award for Measurement and Evaluation.
Blue Rubicon was crowned Outstanding PR Consultancy for the third year running, while Verdant was awarded Outstanding Small PR Consultancy.
The award for Outstanding In-house PR Team went to the Metropolitan Police Service.
CIPR interim CEO Ann Mealor said: ‘Competition for our Excellence Awards has always been strong and I'm delighted to say that this year has been no different. Despite the economic challenges of the past year, our profession continues to produce high calibre work that demonstrates just what PR can achieve.'
The winners were announced at the CIPR Excellence Awards Dinner at The Park Plaza, Westminster Bridge in London last night. The host for the evening was CIPR President-Elect Paul Mylrea, and the compère for the event was BBC London reporter Louisa Preston.
Information about all CIPR Excellence Awards winning and shortlisted campaigns can be found on the CIPR's website.