波本威士忌（Bourbon Whiskey）是多种美式威士忌里的一种，使用比例占总原料51%到80%的玉米作为原料（通常是70%，至于其他的原料则包括小麦、裸麦或其他谷物），蒸馏后酒精度不超过160度（Proof，相当于华氏60度的温度下，容量酒精度数字的两倍，也就是80% ABV），只能使用全新但经过烤桶处理的美国白橡木（Quercus alba，俗称American white oak）木桶陈年，但并未规定最短陈年时限。唯有波本威士忌的其中一种分支——纯波本威士忌（Straight Bourbon Whiskey），有最短两年的陈年时间要求。

Bourbon whiskey /bɜːrbən/ is a type of American whiskey: a barrel-aged distilled spirit made primarily from corn. The name is ultimately derived from the French Bourbon dynasty, although it is disputed whether Bourbon County in Kentucky or Bourbon Street in New Orleans inspired the whiskey's name. Bourbon has been distilled since the 18th century. The use of the term "bourbon" for the whiskey has been traced to the 1820s, and the term began to be used consistently in Kentucky in the 1870s. While bourbon may be made anywhere in the United States, it is strongly associated with the American South, and with Kentucky in particular. As of 2014, the distillers' wholesale market revenue for bourbon sold within the U.S. is about $2.7 billion, and bourbon makes up about two-thirds of the $1.6 billion of U.S. exports of distilled spirits.