单一麦芽苏格兰威士忌（Single Malt Scotch Whisky）是指完全来自同一家蒸馏厂、完全以发芽大麦为原料所制造的苏格兰威士忌。

「单一麦芽苏格兰威士忌」（Single Malt Whisky）在定义上是指完全由同一家蒸馏厂里只用发芽大麦为原料制造，并且在苏格兰境内以橡木桶熟成超过三年以上的威士忌。该注意的是，这定义并没限制同一个瓶子里的酒皆必须出自同一个橡木桶里面，实务上酒厂的调酒师常会根据需要，以自己厂里生产的不同酒桶（乃至于不同装桶年份的酒桶）里取出的威士忌混合调制再装瓶销售。瓶签上标示的年份是熟成时间最短的那桶威士忌的年份。

Single malt Scotch is single malt whisky made in Scotland. To be a single malt scotch the whisky must have been distilled at a single distillery using a pot still distillation process and made from a mash of malted grain. In Scotland, the only grain allowed to be used in a single malt whisky is barley. As with any Scotch whisky, a single malt Scotch must be distilled in Scotland and matured in oak casks in Scotland for at least three years. (Most single malts are matured longer.)