Context: Adopting diverse perspectives is increasingly important for athletic trainers (ATs) to provide care that fosters inclusion for all patients. Despite the NATA's commitment to diversity, NATA membership remains approximately 80% White. Additionally, although ATs work with people from ethnically diverse backgrounds with unique body expression and body-size characteristics, it is unknown whether athletic training textbooks represent this diversity. Objective: To investigate diversity characteristics of images including patients and clinicians within athletic training textbooks. Design: Cross-sectional study. Patients or Other Participants: Twenty percent (n = 15) of athletic training and health care textbooks included on the Board of Certification reference list were selected. Twenty percent of chapters from those textbooks were then randomly selected for inclusion. Main Outcome Measure(s): Descriptive statistics were calculated for person (athlete, nonathlete, clinician), setting (athletic venue, clinic, physician office, other), and demographic categories (perceived skin tone, race/ethnicity, age, gender, body size, body expression). Chi-square tests of goodness of fit were performed to determine significant differences between categories, and [chi-squared] tests of independence were performed to determine differences across person type and category and across textbook domain and category. Results: One thousand six hundred sixty-seven people were assessed from 1190 images. Images depicted statistically more persons with light skin tone (86%) assumed to be White (86%), young adults (75%) of average weight (95%), with no body expression diversity (95%). There were no major differences in subject characteristic majorities across person type or textbook domain. Conclusions: Like other health care professions, a lack of image diversity was demonstrated within athletic training textbooks. To better recruit diverse students to the athletic training profession, and to prepare professional students to provide culturally competent and patient-centered care, these resources should better represent the diversity of ATs and their patients.