Abstract
Using old data is not a new business in nonprofit research. However, the importance and potential of using old data for new nonprofit research seemed to be underestimated. This article reemphasizes the necessity of using old data, categorizes various old data, and showcases how to use them to advance nonprofit research. This article also discusses the process and issues of making old data available, accessible, and searchable and urges nonprofit scholars to publicize their data to enhance academic transparency and accountability and benefit new research.