Patricia Hodgson is leaving the BBC Trust to take up a new role at Ofcom, having been passed over for the top job at the corporation.
Hodgson will join the board on 1 July as non-executive director, an appointment that lasts three and a half years. She will also become deputy chairman next January.
Hodgson, a former chief of the Independent Television Commission prior to the merger with Ofcom, had been one of the names in the frame for chair of the BBC Trust. The former governor of Hong Kong and Tory peer Chris Patten was selected by DCMS in February.
Her departure marks the end of nearly 30 years at the BBC, having first joined as deputy secretary, and holding a number of roles including head of policy, director of policy and planning and later trustee.
Lynne Brindley, chief executive of the British Library, is also joining as non-executive director.
Culture secretary Jeremy Hunt, who made the appointments, said: “It is essential the regulator has people with extensive skills and experience on its board. I am delighted to be appointing two such people.
“They will bring a wealth of experience and expertise to the regulator. I have no doubt they will play a major part in helping Ofcom carry out its essential role.”
Ofcom non-executive directors receive £42,519 a year for up to two days per week. The deputy chairman receives £70,000 a year for up to two-and-a-half days a week.