The BBC Natural History Unit is a department of the BBC which produces television, radio and online content with a natural history or wildlife theme. It is best known for its highly regarded nature documentaries, including The Blue Planet and Planet Earth, and has a long association with David Attenborough's authored documentaries, notably Life on Earth. Each year it produces around 100 hours of television and 50 hours of radio programmes, making it the largest wildlife documentary production house in the world.
The Natural History Unit has been based in Broadcasting House, Bristol since its formation in 1957, and is currently headed by Dr Wendy Darke. It is a specialist department within BBC Factual Production, which is itself part of BBC Vision Productions. Natural history content from the Unit is marketed internationally under the BBC Earth brand by the corporation's commercial arm, BBC Worldwide.