In Asia-Pacific the review is expected to affect ten markets where Aviva operates. These include Australia, China, India, Korea, Sri Lanka, Hong Kong, Singapore, Malaysia, Taiwan and the Middle East.
Aviva’s account in Asia-Pacific is split between different agencies.
In Singapore the insurance moved its media from ZenithOptimedia to Mindshare last year.
Globally Aviva uses a variety of agencies from each of the five major global media networks across different markets.
The company’s incumbent media agencies are currently being briefed on the review.
Amanda Mackenzie, the Aviva group marketing director, said: "We have got significant global media investment and we are a global brand, so it makes perfect sense to consolidate into one media agency or network."
A shortlist for the business has yet to be drawn up, with chemistry meetings scheduled to take place early next month.
Earlier this month, Aviva appointed BBDO India as its creative agency, as part of a global brand alignment.
Aviva recently announced the transition of all businesses under one global brand. BBDO has been involved with the development of Aviva’s global brand positioning.
In July, Aviva's CEO Shaun Meadows told Media he was using a mass-market strategy to set the brand apart from its rivals.
Earlier in the year the insurance company had announced the transition of all businesses under one global brand.
The company has recently withdrawn its long-standing sponsorship of Aviva Badminton in a move that had surprised many.