Glen Spey was founded by the licence holder of Macallan, James Stuart, who altered an old mill to make it a distillery in 1884.

It currently belongs to the same family as Knockando, The Singleton of Auchroisk, and Strathmill. All are part of  Diageo.
Glen Spey malt contributes to blends like Spey Royal and the vatted malt Stathspey -indeed the vast majority of the output is used in blends. Single malts (rare) appear as part of independent bottlings or in the Diageo's collection "Fauna & Flora".