Gemma
Gemma or GEMMA may refer to:

People and fictional characters
Gemma (given name), includes a list of people and fictional characters with the name
Gemma (surname), includes a list of people with the name

Science and technology
Biology
Gemma (botany), an asexual reproductive structure in plants and fungi
A monotypic genus of the Veneridae family of saltwater clams
Gemma gemma, the type species
A bud-like appendage in ants of the Diacamma genus

Other uses in science and technology
Walter Gemma, a radial aero engine manufactured by Walter Aircraft Engines in the early 1930
Gas phase electrophoretic molecular mobility analysis (GEMMA), a chemical analysis technique
Gemma, the traditional name for the binary star Alpha Coronae Borealis
Gemma, an Arduino-compatible microcontroller designed by Limor Fried

Ships
Italian submarine Gemma
MV Gemma, a Dutch coastal tanker lost in 1951
SS Gemma, a German cargo ship in service during 1928

Other uses
Gemma (organisation), an English organization for disabled lesbians

See also
Jemma (disambiguation)