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Single malt whisky is a whisky made at one particular distillery from a mash that uses one particular malted grain, which is ordinarily barley.

Single malts are typically associated with Scotland, though they are also produced in various other countries. Under the Scotch Whisky Regulations, a "Single Malt Scotch Whisky" must be made exclusively from malted barley (although the addition of E150A caramel colouring is allowed), must be distilled using a pot still, and must be aged for at least three years in oak casks of a capacity not exceeding 700 litres. These constraints may not apply to whisky marketed as single malt that is produced elsewhere. For example, there is no definition of the term single malt in the law of theUnited States, and some American whisky advertised as single malt is produced from malted rye rather than malted barley.