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The ECI Prize is a prize awarded annually from 1986 onwards to an ecologist distinguished by outstanding and sustained scientific achievements. It is awarded jointly by the International Ecology Institute, a non-profit organization of research ecologists based in Germany dedicated to fostering ecological knowledge and awareness, and the Otto Kinne Foundation.

The prize both honors the recipient and requires him or her to serve science and society by authoring a book to be published in the series 'Excellence in Ecology', published by Inter-Research and available at cost price. The ECI Prize carries an endowment of € 6,000 and is awarded alternatively for terrestrial ecology, marine ecology and limnetic ecology.