De Jong, deputy Chef de Mission of the Australian team at Rio 2016, has been with the AOC for 12 years and worked on 10 Olympic campaigns.

In her previous role as director of sport, she oversaw Australia's preparations for Turin 2006, Beijing 2008, Vancouver 2010, London 2012 and Sochi 2014, as well as three editions of the Youth Olympics - Singapore 2010, Innsbruck 2012 and Nanjing 2014.

The AOC will begin the process for recruiting De Jong’s replacement as chief executive next month.

"Having been part of the preparation of three summer, three winter and four youth Australian Olympic teams, I’ve enjoyed a most rewarding career with the AOC," De Jong, a former triathlete and lawyer, said.

"The Rio 2016 Olympic Games was my 10th Olympic campaign.

"With Rio behind us and a solid strategic framework in place to guide the AOC through to 2024, I am proud of the contribution I’ve made.

"Now is the best time for someone else to build on this framework and drive the Tokyo 2020 and 2024 campaigns from the beginning of the new quadrennial - both a formidable and exciting task."

AOC President John Coates, also a vice-president of the International Olympic Committee, described De Jong as "one of Australia’s great sports administrators" and praised her "outstanding contribution" to the Olympic Movement in the country.

"Fiona can be immensely satisfied with all she has accomplished and the legacy she leaves," Coates said.

"Fiona has always brought a passion and energy to her work.

"This personal commitment combined with a decade of incremental improvements to Olympic team operations and her recent work with the AOC Executive and staff driving a strong and robust 10-year strategic framework means she leaves an enduring legacy for the Olympic Movement in Australia.

"In her 12 years at the AOC Fiona served under six Chef de Missions and has become widely respected among the 28 summer and seven winter national sporting federations."

De Jong was forced to deal with a number of controversies involving Australian athletes at Rio 2016, including when criminal proceedings were brought against nine athletes from the country after they gained access to a basketball semi-final with alleged tampered accreditation.

An AOC Disciplinary Committee has since called on Brazilian authorities to remove the criminal records against cyclists Ashlee Ankudinoff and Melissa Hoskins, rugby sevens player Ed Jenkins, archers Alec Potts and Ryan Tyack, rowers Olympia Aldersey, Fiona Albert and Lucy Stephan and hockey player Simon Orchard.

Her departure will see the AOC undertake further restructuring after vice-president Paul Montgomery announced his retirement last month.

"I have seen first-hand the change sport brings to people and places and am privileged to have been at the service of Australian sport through my time at the AOC," De Jong added.

"I’ve been part of making over 1,600 Australian athletes’ Olympic dreams come true, uplifted the standards in sport and created social change programmes, some of which I will continue to be involved in.

"None of this would have been possible without the support of the AOC President, executive, senior management and staff, in particular, John Coates for first opening the door of opportunity back in 2004."