Maria Emma Gray (1787 – 9 December 1876), was an English conchologist, algologist and scientific illustrator.

[1] Her father was Lieutenant Henry Smith, R.N., and he was resident at Greenwich Hospital at the time of her birth.

Between 1842 and 1874 she published privately five volumes of etchings, entitled Figures of Molluscan Animals for the use of Students, and she mounted and arranged most of the Cuming collection of shells in the British Museum.

She also made a study of algae, arranging many sets for presentation to schools throughout the country so as to encourage the pursuit of this subject.

[7] He went on to have a bronze medallion struck in 1863, bearing both their portraits, a copy of which is in the possession of the Linnean Society.