What spelling usually distinguishes American whiskey from Scotch whisky?

American whiskey is usually spelled “whiskey,” with an e, while Scotch whisky is usually spelled without one.

The spelling convention is geographical rather than a strict definition of production quality or flavour. Ireland also commonly uses “whiskey,” while Scotland, Canada, Japan, and many other whisky-producing countries generally use “whisky.” American legal and commercial usage overwhelmingly favours the e-containing form.

The difference developed through historical language and branding practices rather than a single international rule. Some individual products and historical texts do not follow the usual convention, so spelling alone cannot identify every bottle’s origin. The word ultimately comes from forms of the Gaelic term uisge beatha, meaning “water of life.”

This distinction is useful but not absolute. For example, American companies may use “whisky” in a brand name, and some countries permit both spellings. In ordinary usage, however, “whiskey” strongly suggests an Irish or American product, whereas “whisky” commonly suggests Scotch, Canadian, or Japanese whisky.