Earth is a 2007 nature wildlife documentary film which depicts the diversity of wild habitats and creatures across the planet. The film begins in the Arctic in January of one year and moves southward, concluding in Antarctica in the December of the same year. Along the way, it features the journeys made by three particular species—the polar bear, African bush elephant and humpback whale—to highlight the threats to their survival in the face of rapid environmental change. A companion piece and a sequel to the 2006 BBC/Discovery/NHK/CBC television series Planet Earth, the film uses many of the same sequences, though most are edited differently, and features previously unseen footage not seen on TV.

Earth was directed by Alastair Fothergill, the executive producer of the Planet Earth television series, and Mark Linfield, the producer of Planet Earth's "From Pole to Pole" and "Seasonal Forests" episodes. It was co-produced by BBC Natural History Unit and Greenlight Media, with Discovery Network providing some of the funding. In North America, the film was distributed by Walt Disney Studios Motion Pictures as the first film released through the Disneynature label. The same organisations collaborated on Fothergill's previous film, Deep Blue (2003), itself a companion to his 2001 television series on the natural history of the world's oceans, The Blue Planet. The British version of Earth was narrated by Patrick Stewart and the US version was narrated by James Earl Jones.

Earth was released in theaters internationally during the final quarter of 2007 and throughout 2008. With total worldwide box office revenue exceeding $100 million, Earth is the second-highest-grossing nature documentary of all time.

It was later released on 22 April 2009 by Disneynature, and on DVD in September. Disneynature also holds some territories in Latin America.

A sequel, titled Earth: One Amazing Day, was released in the United States on 6 October 2017. It made its world premiere in Beijing.