To explore the incorporation of health literacy practices into clinical trials, the Roundtable on Health Literacy convened a workshop titled Clinical Trials: Practice and Impact on April 11, 2019, in Washington, DC. The workshop presentations and discussion centered around issues related to the challenges or barriers for diverse populations' participation in clinical trials, best practices for clinical trial sites and researchers incorporating health literacy practices, and effective health literacy strategies for clear communication with participants. This publication summarizes the presentation and discussion of the workshop.