Brittin will now become Google's president of business and operations in EMEA, and will continue to be based in London. All country managers will report directly into him.
Brittin formerly oversaw Google's business in northern and central Europe, with southern Europe overseen by former AOL Europe president Carlo d’Asaro Biondo. According to the New York Times, Blondo will now oversee relationships with European policy makers and commercial partners.
It isn't clear whether the Google reorganisation will entail further job changes, Google declined to comment.
Marketing understands that the new set-up is intended to simplify Google's operations in Europe and help the firm work more easily with European officials, governments and partners.
Brittin, a former Olympic rower, took up the top role at Google UK in 2009, taking over from Dennis Woodside who moved to the US.
It's likely Brittin will have to help Google navigate Europe's strict regulatory environment, with the search firm currently under investigation by antitrust officials over its dominanent position in the search market.
In the past, Brittin has faced questions from the Public Accounts Committee over the firm's slim corporation tax payments to the UK, despite substantial earnings.
Famously, he claimed that most of Google's ad sales are actually completed in low-tax Ireland, something committee chair Margaret Hodge described as "deeply unconvincing".