Grin, grins, or GRIN may refer to: * A facial expression, see

smile A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses ...

* ''Grin'' (Coroner album), 1993 * Grin (band), a band formed by Nils Lofgren ** '' Grin (Grin album)'', 1971 * "Grins" (song), a 2013 song by Charli XCX off the album ''True Romance'' (Charli XCX album) * Grin (surname) *

Grins, Austria Grins is a municipality in the Landeck district in the Austrian state of Tyrol located 3.7 km west of Landeck and 18 km east of Sankt Anton am Arlberg. The village has 10 subdivisions. Settlement of the area already began 2000 years ago b ...

Germplasm Resources Information Network Germplasm Resources Information Network or GRIN is an online USDA National Genetic Resources Program software project to comprehensively manage the computer database for the holdings of all plant germplasm collected by the National Plant Germpl ...

, a software project * Grin (company), a defunct Swedish video game developer *

GRIN Campaign GRIN Campaign, Global Respect in Education, is a transatlantic non-profit organisation and advocacy group which campaigns primarily for lesbian, gay, bisexual, transgender, and queer/ questioning (LGBTQ) people's social and political equality in e ...

, an organisation which campaigns for equality in education * GRIN, an acronym for gradient index; see

Gradient-index optics Gradient-index (GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material. Such gradual variation can be used to produce lens (optics), lenses with flat surfaces, or lenses that do n ...

See also