Grin

Grin may refer to:

• A facial expression; see Smile
• Alexander Grin (1880–1932), Russian novelist
• Grin (Coroner album), 1993
• Grin (band), a band formed by Nils Lofgren
  • Grin (Grin album), 1971
• Grin (company logo), for a popular merchandise company; see Grinline

GRIN may refer to:

• GRIN (company), a defunct video game developer formerly based in Sweden
• GRIN, an acronym for gradient index; see Gradient-index optics
• GRIN, an acronym for Genetic, Robotic, Information, and Nano technologies
• Germplasm Resources Information Network, a software project
• Grand River Information Network, a Grand River Conservation Authority online mapping and data download tool