Single pot still whiskey is a phrase used by the Irish whiskey industry and in Irish whiskey criticism to describe a particular style of whiskey made from a mixed mash of maltedbarley and unmalted "green" barley in a pot still. This type of whiskey has also been referred to as pure pot still whiskey, Irish style pot still whiskey, or, especially in Ireland, simply as pot still whiskey; the current term came into use on some labels around 2010, and many old bottles of the style are labeled with older terminology. The newer term was brought into use when the United StatesTax and Trade Bureau objected to the use of the term "pure" in the marketing name for such a product. In some locations, including the US, the term "pure pot still whiskey" remained in current use as of 2011 for the marketing of at least one Irish whiskey (due to being "grandfathered" as a labelling term for a previously existing product brand name); however, its maker indicated a plan to transition to the new term for all product labels.
The term should not be confused with the theoretical concept of whiskey produced solely in a pot still (which would also apply to single malt whiskey as well as some examples of pot still bourbon and rye whiskey).