A chocolate bar (Commonwealth English) or candy bar (some dialects of American English) 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.

The manufacture of a chocolate bar from raw cocoa ingredients requires many steps, from grinding and refining, to conching and tempering. All these processes have been independently developed by chocolate manufacturers from different countries. There is therefore no precise moment when the first chocolate bar came into existence. Solid chocolate was already consumed in the 18th century. The 19th century saw the emergence of the modern chocolate industry; most manufacturing techniques used today were invented during this period.

Dark, milk and white are the main types of chocolate. Ingredients not derived from cocoa have been added to bars since the beginning of the chocolate industry, often to reduce production costs. A wide variety of chocolate bar brands are sold nowadays.