To examine the concept retention from an implicit bias classroom workshop, we administered a self-developed seven-item seven-point Likert-scales survey to our medical students at pre-, post-, and one-year post-workshop attendance. The data set was comprised of survey results from two cohorts of our third and fourth-year medical students from 2018 to 2020, included 289 completed records at three measurement points.This dataset also includes the following extended data: the document from a locally created 7-item survey for evaluating students' agreement on a physician or person's perception and management of unconscious bias.