The Arannayk Foundation (AF), also known as the Bangladesh Tropical Forest Conservation Foundation, is a not for profit company (limited by guarantee and not having a share capital), established in 2003 by the joint initiative of the Governments of the People's Republic of Bangladesh and the United States of America based on the provisions of the US Tropical Forest Act of 1998, which seeks to contribute to the conservation of biodiversity assets of tropical forests.

The mission of AF is to facilitate the conservation, protection, restoration and sustainable use of tropical forests in Bangladesh, which provide a wide range of benefits to mankind, by providing financial grants or other support to qualified organizations or entities.