A method and computer system for implementing an enhanced interactive hierarchical chart legend and data displays with hierarchical data with multiple levels. A data hierarchy display chart visualization is generated. A legend associated with and independent of the display chart visualization is generated to display the data hierarchy in full as a tree structure. The legend is provided in a collapsible tree list format; and in response to a request, using the legend, a selected portion of the data hierarchy display chart visualization is displayed, showing the data hierarchy only on certain nodes of the tree structure.