The rebrand sees the company adopt a new logo (pictured) and marketing slogan: 'Engage Your World', both of which were developed by its in-house creative team in the US.
BI said that the move marked the "next stage of integration" of its regional headquarters in the UK, Australia, Canada, China, India and the US, and its presence in Germany and Singapore.
Mike Davies, BI’s managing director, said: "We are now a truly global business and our brand is changing to reflect this.
"Our services are also evolving to support our clients' needs, but our mission remains to produce measurable results for all our clients wherever they are in the world, by engaging with employees, channels and consumers.
"Our goals are to build on our recent successes and double the size of each international business in six years across all our service areas."