The rolling six-month contract – which is a separate account to that of EMC – will kick off on 1 February.
RSA wants to increase its profile by targeting national and broadcast media, in addition to trade press.
Natasha Staley, RSA EMEA PR manager, said: ‘We want to inject more creativity and edge into our PR strategy. Using Golin Harris means we have visibility to the two accounts, creating consistency of message.’
The firm was acquired by data storage company EMC Corp at the end of last year for $2.1bn (£1.5bn).