Is there dairy in white chocolate bars?

White chocolate does contain dairy.

While it does not contain cocoa solids like dark or milk chocolate, white chocolate is made from cocoa butter, sugar, milk solids, and vanilla. Cocoa butter is the fat that is extracted from cocoa beans, and milk solids are the solids that are left after milk is heated and water is evaporated. White chocolate is made with a higher proportion of cocoa butter and sugar than other types of chocolate, which gives it its creamy texture and sweet flavor.