Gemma or GEMMA may refer to:
People and fictional characters Gemma (given name), including a list of people and fictional characters with the name Gemma (surname), including a list of people with the name
Science and technology Biology Gemma (botany), an asexual reproductive structure in plants and fungi Gemma, a monotypic genus of the Veneridae family of saltwater clams Gemma gemma, the type species Gemma, a bud-like appendage in ants of the Diacamma genus
Other sciences 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 (language model), a family of open-weight models developed by Google Alpha Coronae Borealis or Gemma, a binary star Gemma, an Adafruit Industries Arduino-compatible microcontroller
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 organization and magazine for disabled lesbians in England
See also Jemma (disambiguation)