Grin
Grin as first name:
Grin as a family name:
- Alexander Grin (1880–1932), Russian writer
 - Êlda Grin (1928–2016), Soviet and Armenian psychologist and writer
 - François Grin (* 1959), Swiss economist and linguist
 - Jean-Pierre Grin-Hofmann (* 1947), Swiss politician
 - Juri Grin (* 1955), physicist, director at the Max Planck Institute for Chemical Physics of Solids
 - Wolfgang Grin (* 1966), Austrian doctor and writer
 
Grin as a pseudonym:
- Alexander Pawlowitsch Guljajew (1908–1998), Soviet chess composer
 
Grin as the company name:
GRIN as an abbreviation:
- Germplasm Resources Information Network
 - Global Raptor Information Network
 - Gradient index lens, a component of gradient optics
 - official abbreviation for "Great Images in NASA "