Peter Henry Emerson (1856 – 1936) was a British photographer.
He bought his first camera in 1882 and spent the next several years studying and experimenting in photography. By 1885 he was exhibiting his work and winning prizes widely. In 1889 Peter Henry Emerson published Naturalistic Photography a handbook detailing his approach and the theories he believed supported it. Although he did not publish or exhibit his work after 1900, Peter Henry Emerson's influence on photography was profound. He is often called the father of art photography and supported and recognized talent in other photographers. Alfred Stieglitz was first recognized by Peter Henry Emerson , who awarded him first prize in a competition. He also produced a book on Julia Margaret Cameron who was widely regarded as a photographic crank by many of her contemporaries.