Nazo Moosa, a Charity Commission board member and chair of its audit and risk committee, will stand down in September because she cannot commit sufficient time to the role.
Moosa, who will step down on 18 September, has been a board member since May 2013.
"Unfortunately, it has been increasingly difficult lately to combine the time commitment the board role has required with my full-time job, which involves considerable international travel," she said. "I have therefore tendered my resignation with regret."
Moosa is a managing partner at the investment company C5 Capital. According to her LinkedIn profile, she is also a non-executive director at Metrasens, a company in the C5 portfolio. She started a four-year term on the board of Arts Council England in September 2013.
William Shawcross, chair of the commission, said: "Nazo has made a very important contribution as a member of the Charity Commission board over the past year. Her experience in change management and her business expertise has been invaluable to the commission during the past year as we have embarked on a wide-ranging programme of change and improvement."
Alongside Moosa and Shawcross, there are a further six board members at the commission and a further independent member of the audit committee. Appointments to the board are made by the minister for the Cabinet Office.
Recruitment for Moosa’s role will begin shortly.