Sir Adrian Montague will retire as Aviva chairman later this year once the company board appoints a successor.
Montague joined the firm as a non-executive director in 2013 and became chairman in 2015.
He is currently also the chairman of The Manchester Airports Group and Cadent Gas and is a trustee of the Commonwealth War Graves Foundations and chairman of TheCityUK advisory council.
Adrian has chaired Aviva through a period of considerable change and departs with our very best wishes for the strong legacy he leaves"
Montague was also a former Anglian Water Group chairman and deputy-chairman of Network Rail. He also held the role of chief executive the Treasury Taskforce and was formerly a partner at law firm, Linklaters.
Aviva senior independent director George Culmer said: "On behalf of the board, I would like to express our deep thanks to Adrian for his service, leadership and guidance over the past seven years. Adrian has chaired Aviva through a period of considerable change and departs with our very best wishes for the strong legacy he leaves."
Montague added: "Now that [chief executive Maurice Tulloch] has launched Aviva's strategy, a new senior management team is in place and the board has been refreshed, it is also time for a new chairman.
"In the meantime I remain committed to this great organisation which I am confident will deliver for all its customers, employees and shareholders."
This article was first published by Professional Adviser, a sister title to International Investment