The Wonka Bar is a fictional chocolate bar, introduced as a key story point in the 1964 novel Charlie and the Chocolate Factory by Roald Dahl. Wonka Bars appear in each film adaptation of the novel: Willy Wonka & the Chocolate Factory (1971); Charlie and the Chocolate Factory (2005); and Wonka (2023). The bar also appeared in Charlie and the Chocolate Factory the Musical (2013).

A chocolate bar is a confection containing chocolate, which may also contain layerings or mixtures that include nuts, fruit, caramel, nougat, and wafers. A flat, easily breakable, chocolate bar is also called a tablet. In some varieties of English and food labeling standards, the term chocolate bar is reserved for bars of solid chocolate, with candy bar used for products with additional ingredients.