Mr Bentley previously worked as head of propositions at Skandia and was at Skandia and its parent company Old Mutual Wealth for over 12 years.
He then left following a restructure of the firm and set up his own investment consultancy Graham Bentley Investment Insight (gbi2).
He will begin his role at AXA Wealth on 2 July until a permanent appointment is found.
AXA said that his brief would be to "ensure that AXA Wealth delivers the best combination of customer and IFA facing solutions, as well as ensuring AXA secures the best possible commercial terms for its investors."
{desktop}{/desktop}{mobile}{/mobile}
Mike Kellard, chief executive of AXA Wealth, said: "Our business is well placed for the changing investment and platform environment we are in. However, we must continue to look ahead to how we see the investment world in future years. Graham's extensive experience will be vital in this process."
Mr Bentley said: "I set up my consultancy business because I believe tomorrow's financial services businesses need to differentiate themselves from their competitors. They must identify profitable markets and customer needs within them, and subsequently create innovative and relevant product responses.
"AXA Wealth is a fully integrated investment management and distribution business. It is ambitious and refreshingly forward thinking, with a first-rate management team. I am delighted to undertake this project and to contribute to AXA Wealth's future success."

• Want to receive a free weekly summary of the best news stories from our website? Just go to home page and submit your name and email address. If you are already logged in you will need to log out to see the e-newsletter sign up. You can then log in again.