Jack Daniel's is a brand of Tennessee whiskey and the top selling American whiskey in the world. It is produced in Lynchburg, Tennessee, by the Jack Daniel Distillery, which has been owned by the Brown-Forman Corporation since 1956. The product meets the regulatory criteria for classification as a straight bourbon, though the company disavows this classification and markets it simply as Tennessee whiskey rather than as Tennessee bourbon. As defined in the North American Free Trade Agreement, Tennessee Whiskey is classified as a straight bourbon authorized to be produced in the state of Tennessee. 

The mash for Jack Daniel's is made from corn, rye and malted barley, and is distilled in copper stills. It is then filtered through 10-foot (3.0 m) stacks of sugar maple charcoal. The company refers to this filtering step as "mellowing". This extra step, known as the Lincoln County Process, removes impurities and the taste of corn. The company argues this extra step makes the product different from bourbon. However, Tennessee whiskey is required to be "a straight Bourbon Whiskey" under terms of the North American Free Trade Agreement and Canadian law.

Jack Daniel's is the alcoholic component of "Jack and Coke", a common cocktail.