The American Museum of Natural History (abbreviated as AMNH), located on the Upper West Side of Manhattan in New York City, United States, is one of the largest and most celebrated museums in the world. Located in park-like grounds across the street from Central Park, the Museum comprises 25 interconnected buildings that house 46 permanent exhibition halls, research laboratories, and its renowned library.

The collections contain over 32 million specimens, of which only a small fraction can be displayed at any given time. The Museum has a scientific staff of more than 200, and sponsors over 100 special field expeditions each year.

The Museum was founded in 1869. Prior to construction of the present complex, the Museum was housed in the Arsenal building in Central Park. Theodore Roosevelt, Sr., the father of the 26th U.S. President, was one of the founders along with John David Wolfe, William T. Blodgett, Robert L. Stuart, Andrew H. Green, Robert Colgate, Morris K. Jesup, Benjamin H. Field, D. Jackson Steward, Richard M. Blatchford, J. Pierpont Morgan, Adrian Iselin, Moses H. Grinnell, Benjamin B. Sherman, A. G. Phelps Dodge, William A. Haines, Charles A. Dana, Joseph H. Choate, Henry G. Stebbins, Henry Parish, and Howard Potter. The founding of the Museum realized the dream of naturalist Dr. Albert S. Bickmore. Bickmore, a one-time student of Harvard zoologist Louis Agassiz, lobbied tirelessly for years for the establishment of a natural history museum in New York. His proposal, backed by his powerful sponsors, won the support of the Governor of New York, John Thompson Hoffman, who signed a bill officially creating the American Museum of Natural History on April 6, 1869.

A museum of natural history is a museum with exhibits about natural history, including such topics as animals, plants, ecosystems, geology, paleontology, and climatology. Some museums feature natural-history collections in addition to other collections, such as ones related to history, art and science. Nature centers often include natural-history exhibits too.

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Natural history is the scientific research of plants or animals, leaning more towards observational rather than experimental methods of study, and encompasses more research published in magazines than in academic journals. Grouped among the natural sciences, natural history is the systematic study of any category of natural objects or organisms. That is a very broad designation in a world filled with many narrowly focused disciplines. So while modern natural history dates historically from studies in the ancient Greco-Roman world and the medieval Arabic world through to the scattered European Renaissance scientists working in near isolation, today's field is more of a cross discipline umbrella of many specialty sciences. For example, geobiology has a strong multi-disciplinary nature combining scientists and scientific knowledge of many specialty sciences.

A person who studies natural history is known as a naturalist or "natural historian".

The English term 'natural history' is a translation of the Latin naturalis historia. Its meaning has narrowed considerably over time (see also History below). In antiquity, it covered more-or-less anything which is connected with nature or which uses materials drawn from nature; see for example the contents of Pliny's encyclopedia of this title, published circa 77 to 79 AD.