Henry Michael John Underhill (1855–1920) was an amateur scientist, artist, photographer and grocer from Oxford, England.

[1] Underhill is best known for his hand-painted and photographic lantern slides which illustrate a variety of subjects including entomology, natural history, prehistoric British archaeology and folk tales.

One of Underhill's earliest magic lantern shows was given to the pupils of the Oxford Ragged School, which his grandfather, father and uncle had helped to establish.

The lecture was attended by British archaeologist Arthur Evans, then keeper of the Ashmolean Museum, and the Hope Professor of Zoology, Edward Poulton.

The photographs are significant in the modern day as they depict a number of monuments which no longer survive;[4] they are now held by the Oxford University History of Science Museum.