“Legal Literacies for Text Data Mining” outlines for digital humanities researchers and professionals some of the core skills and understandings needed to navigate law, policy, ethics, and risk in digital humanities text and data mining (TDM) projects, with reference to common DH use cases. We also reflect on the outcome of our NEH-funded, four-day Institute for Advanced Topics on this theme (https://buildinglltdm.org/) hosted online by UC Berkeley in June of 2020.