Sky has made one of the biggest individual donations - around £5m, according to the London Evening Standard - to fund the creation of one of the central large gardens on the bridge.
The company's chief executive Jeremy Darroch commented: "We are delighted to support the Garden 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."
Lord Mervyn Davies, chairman of the Garden Bridge Trust, commented: "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."
It will cost £175m to deliver the Garden Bridge project. More than 77 per cent of the capital costs to build the bridge will be raised from the private sector. The trust says it is well on its way to meeting its target with £145m raised for the Bridge so far, including £85m from private sources.