Sky has been named as one of the private backers of the controversial Garden Bridge, and will name part of the new structure.
The undisclosed donation to the Garden Bridge Trust is part of £85m raised from private sources in an effort to fill the funding gap between public funding allocated to it and the £175m it will cost to build.
"We are delighted to have the support Sky, which plays such a major role in UK culture. The Garden Bridge Trust has huge support as this announcement demonstrates. It is thanks to the support of so many donors that this world class project and imaginative green space is coming to life," said chairman of the trust Lord Mervyn.
Sky's is one of the biggest single donations and will name one of the large central gardens on the Thomas Heatherwick designed bridge.
"The project will enrich London, helping us to give back to the city where Sky was founded over twenty five years ago and remains headquartered today," said Sky chief executive Jeremy Darroch. "The Garden Bridge will create a beautiful and tranquil space for us all to enjoy, and will become an iconic landmark in the heart of our capital city.”