Grey or gray is an achromatic or neutral color.

Complementary colors are defined to mix to grey, either additively or subtractively, and many color models place complements opposite each other in a color wheel. To produce grey in RGB displays, the R, G, and B primary light sources are combined in proportions equal to that of the white point. In four-color printing, greys are produced either by the black channel, or by an approximately equal combination of CMY primaries. Images which consist wholly of neutral colors are called monochrome, black-and-white or greyscale.

The first recorded use of grey as a color name in the English language was in AD 700.Grey is the British, Canadian, Australian, Irish, New Zealand and South African spelling, although gray remained in common usage in the UK until the second half of the 20th century.Gray is the preferred American spelling, although grey is an accepted variant.Gray became the preferred spelling in American English around 1825.

Most grey pigments have a cool or warm cast to them, as the human eye can detect even a minute amount of saturation.^{[citation needed]}Yellow, orange, and red create a "warm grey". Green, blue, and violet create a "cool grey". When there is no cast at all, it is referred to as "neutral grey", "achromatic grey" or simply "grey".

Holly Brook Hafermann (born February 23, 1986) better known by her stage name Skylar Grey, is an five-time Grammy-nominated American multi-instrumentalist, singer, songwriter, and record producer. Grey was signed to Machine Shop Recordings under the name Holly Brook. She released her debut album as Holly Brook, Like Blood Like Honey, in 2006. She co-wrote the three versions of "Love the Way You Lie" (for Eminem and Rihanna) with Alex da Kid, who signed her to his Wonderland Music label. She was featured as a guest vocalist on Fort Minor's "Where'd You Go" and "Be Somebody", Diddy-Dirty Money's "Coming Home", Dr. Dre's "I Need a Doctor", Lupe Fiasco's "Words I Never Said" and Kaskade's "Room for Happiness".

Grey performed professionally as a child in a folk duo with her mother called Generations. Together, (with producer/engineer Randy Green) they independently produced three albums, Dream Maker, Lift Me, and Millennial Child/Waiting For You. Grey started her first band at the age of fifteen after 'sneaking' into bars, working with jazz musicians including Jeff Eckles, Tim Whalen and Leo Sidran in Madison, Wisconsin.