Arthur Henry Machell Cox (11 November 1870 - 1947) was an English ornithologist.
Cox was born in Hazelwood, Derbyshire, England, on 11 November 1870. He was educated at Trinity College, Cambridge, before working as a teacher and then headmaster at various schools in Devon. He contributed to ornithological research in Devon, was a founding member of the Devon Bird Watching and Preservation Society in 1928 and from 1931 a member of the Cornwall Bird Watching and Preservation Society. He died in 1947, by which time he had moved to Somerset.
- ACAD – A Cambridge Alumni Database accessed 27 March 2012
- Jenks, D., 1998. Birth of the Devon Bird Watching and Preservation Society. The Magazine of the Devon Bird Watching and Preservation Society, 51(3), pp. 3–20.
- Jenks, D., 2004. A history of Devonshire ornithology: a review of the literature, events and personalities from prehistoric times to the end of the twentieth century, Falmouth: Isabelline Books.