Wanjira Mathai is a Kenyan environmentalist and activist. She is Managing Director for Africa and Global Partnerships at the World Resources Institute, based in Nairobi, Kenya. In this role, she takes on global issues including deforestation and energy access. She was selected as one of the 100 Most Influential Africans by New African magazine in 2018 for her role serving as the senior advisor at the World Resources Institute, as well as for her campaign to plant more than 30 million trees through her work at the Green Belt Movement.