GreenViet is a Vietnamese non-profit organisation that works to raise awareness about the country's biodiversity. The organisation has over 200 volunteers that help to monitor illegal activities in Son Tra Nature Reserve. This forest is home to the endangered red-shanked douc langur.

Dr Ha Thang Long is the Chairman of GreenViet. He has worked in the wildlife conservation field since 1999 in the Endangered Primate Rescue Centre, Cuc Phuong National Park. Following a study of Grey-shanked Douc Langur ecological behaviour, Long founded GreenViet and signed the organisation up to the Biodiversity Programme of Frankfurt Zoological Society. He has gone on to establish the Biodiversity Conservation Centre in central Vietnam, and is currently an invited lecturer in biodiversity conservation at Danang University.