Mountain Dew, currently predominantly stylized as Mtn Dew, is a soft drink by PepsiCo, but which remains its own brand. The formula was made and first marketed in Marion, VA, Knoxville and Johnson City, Tennessee, USA through the 1940s, then in Fayetteville, North Carolina by Barney and Ally Hartman. By 1964, it was being distributed across the United States.[1] The formula was created by Bill Jones. The name is taken from a colloquial term for moonshine whiskey, and early bottles and signage carried the reference forward by showing a cartoon stylized mountaineer (sometimes holding a jug). As of 2010, Mountain Dew passes Diet Coke, becomes No. 3 soft drink in U.S.[2] Mountain Dew's Diet version ranked 9th in sales.[3] On October 15, 2008, Mountain Dew's logo was redesigned to "Mtn Dew", as a result of a PepsiCo rebranding of its core products. However, the flavors "LiveWire" and "Code Red" still use the previous design as of September 2010.[4][5]

In the UK, a new variant, 'Mountain Dew Energy', was introduced into the energy drink market in 2010.[6] Mountain Dew was previously marketed in the UK in 1995, with a TV spot having the strapline "Wild colour, smooth taste." It was unsuccessful, and the sale of Mountain Dew in the UK was discontinued (except for imports) by 1997.