Naziha Mestaoui (1975 – April 29, 2020) was a Belgian artist trained in architecture, who lived and worked in Paris. She worked both collectively (LAb(au), Electronic Shadow) and individually, and received awards in several countries. As an environmental artist and activist, she was best known for "One Heart, One Tree" at the United Nations Climate Conference (COP21) in December 2015. The participatory art installation supports reforestation on several continents.