Natural World was a strand of British wildlife documentary series broadcast on BBC Two and BBC Two HD and regarded by the BBC as its flagship natural history series. It was the longest-running documentary series in its genre on British television, with nearly 500 episodes broadcast since its inception in 1983. Natural World episodes were typically films that take an in-depth look at particular natural history events, stories or subjects from around the globe.

Natural World was produced by the BBC Natural History Unit in Bristol under the stewardship of the series editor, who was responsible for commissioning or acquiring content. Programmes are a mixture of in-house productions, collaborative productions with other broadcasters or acquisitions from independent producers. There was 10 episodes broadcast each year, of which approximately half are produced in-house. The series has close ties with the US series Nature, broadcast by PBS.

The last episode was broadcast on 20 March 2020 with no new upcoming episodes currently listed, ending the long-running documentary series in the world after 37 years.