Bennett, the executive responsible for resurrecting Doctor Who and introducing Strictly Come Dancing, will step down from her post as the president of the BBC's worldwide networks and global iPlayer in the autumn.
This follows a major reorganisation of BBC Worldwide to reconfigure the business from divisional to geographic lines.
Prior to joining BBC Worldwide in 2010, Bennett held several senior roles in the BBC's television operation, including her final position as head of BBC Vision, the corporation's production division.
While at BBC Television, she helped successfully relaunch Doctor Who in 2004, revamped Strictly Come Dancing for a modern audience and brought The Apprentice to the BBC.
She also oversaw BBC television production during the shift to multi-platform, including the introduction of the BBC Red Button, BBC HD channels, catch-up platform BBC iPlayer and digital media production.
Bennett did not reveal her next move, but did say that she would bring her experience "to another area of international media".
"After more than ten years with BBC Television both within the UK and internationally, there is much here that I will miss. I will leave with huge pride in what the Corporation stands for, both here and abroad," said Bennett.
"I would like to thank the talented and dedicated teams I have worked with and wish all the best to an exceptional organisation while I look forward to bringing my experience to another area of international media."
BBC director general Mark Thompson, who will also leave the corporation in the autumn, said that the BBC has been "fortunate" to benefit from Bennett's talents.
"As a director of television, and later director of Vision, she was second to none, with a record that speaks for itself in both reach and appreciation across the many services she was responsible for," he said.
"In that role, she brought to our screens much loved shows from Strictly Come Dancing, the new Doctor Who and Planet Earth as well as comedies like The Thick of It and Miranda and boosted our specialist factual output in science, arts and culture.
"Over the past decade, she has played an important role in steering the BBC into the digital age, building the new channel portfolio with BBC Three and Four and our much loved children's channels."
At Worldwide, Bennett focused on developing the BBC's international television channels, the biggest revenue generator for the business, including the introduction of channels to new markets such as Brazil and Taiwan.
She also oversaw the launch and expansion of Global iPlayer, a subscription-based version of the on-demand TV platform that is now available in 16 countries.
Bennett said that her time at BBC Worldwide has been "exciting and stimulating".
"I am delighted to have grown the BBC's international channel portfolio at a time when global markets are so highly competitive and to have brought quality British programmes and events to new audiences around the world both through our worldwide networks and the Global BBC iPlayer pilot," she said.
"Today's announcement about the new organisation of BBC Worldwide, with regions in future holding P&L responsibility, is an important step in securing the future growth of BBC Worldwide enabling it to compete more effectively in the global market and deliver increasing returns to the BBC.
"I was pleased to have played a significant role in the organisational design process and fully support the changes under [Worldwide chief executive] John Smith's leadership. However with the move of P&L responsibility under the new structure I feel this is a good moment for me to work outside BBC Worldwide."
She will remain with BBC Worldwide until late autumn, in order to give a full handover of her responsibilities and oversee a "number of major commercial deals".
Smith said that Bennett has made a "hugely positive contribution" to Worldwide during her time at the business.
"She deserves our gratitude, and leaves us a great legacy to build on. She has extended our channels internationally, driven schedule changes which have translated into ratings and advertising uplifts, and moved forward our digital offer across several platforms," he said.
"She has also secured some important market entries in Latin America, Asia and EMEA, which will form the cornerstone of our future business there.
"I am sorry to lose someone of her calibre, as we refocus our business on regional opportunities, but I am grateful she will remain with us for a time to deliver a number of strategically important projects across the world."