("Nature and Biodiversity Conservation Union") or NABU is a German non-governmental organisation (NGO) dedicated to conservation at home and abroad, including the protection of rivers, forests and individual species of animals.

NABU carries out specific conservation projects, maintains a research institute, runs environmental training and informs the media and public about important topics connected with the environment and nature conservation.

NABU has, together with its sister organisation in Bavaria, about 830,000 members (as of June 2022[update]) as active conservationists or supporters.

The NABU was founded by Lina Hähnle on 1 February 1899 in Stuttgart as the Bund für Vogelschutz (BfV).

In 1990 the BfV merged with former DDR Naturschutz society to Naturschutzbund Deutschland (NABU).