The 41-year-old actor made the announcement at the World Economic Forum's Crystal Award Ceremony in Davos, Switzerland, reported US magazine.
"The Revenant" actor was honoured for his work in tackling the ongoing climate crisis.
"Generosity is the key to our future. With that, I am pleased to announce today over USD 15 million in new commitments from LDF to fast-track cutting-edge sustainability and conservation projects around the world," DiCaprio said.
A portion from the funds will go toward protecting the last remaining rain forests, including the Amazon in Ecuador, where the palm oil industry is threatening the vast span of land.