Ethel Frances Butwell Bellamy (17 November 1881 – 7 December 1960) was an English astronomical computer and seismologist known for her significant contributions to the field of astronomy and seismology.

She performed computations for Oxford's contributions to the Carte du Ciel and Astrographic Catalogue projects, under the directions of the Savilian Professor of Astronomy, Herbert Hall Turner.

[4] After the completion of Oxford's role in the Astrographic Catalogue, Turner decided to assist the Vatican Observatory, which was having difficulty with its computations.

[2] From 1911 to 1928, Bellamy performed the reductions on the measurements and prepared the results for publication;[1] the analysis of the Vatican's zone was "wholly in [her] hands".

These seismometers worked by measuring traces of passing vibrations that had been enlarged and transcribed onto a moving roll of photographic paper using light.

[5] After Turner, or, from 1923, a new assistant called Joseph Hughes, had computed the epicentres of earthquakes, Bellamy prepared the results for publication in the International Seismological Summary (ISS).

[1] In 1939, Bellamy published a paper in Nature in 1939 that focuses on the geographical distribution of epicenters of earthquakes recorded by the Seismological Committee of the British Association from 1913 to 1932.