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Background:The 2017 American College of Cardiology (ACC)/American Heart Association (AHA) guidelines on hypertension recommend a threshold blood pressure (BP) of ࣙ130/80 mmHg for diagnosis of hypertension and treating hypertension to a goal BP of <130/80 mmHg. For this study, we assessed the rate of compliance to the 2017 ACC/AHA hypertension guidelines by internal medicine residents and cardiology fellows in clinics affiliated with a teaching hospital in New York, New York. Methods: We conducted a retrospective medical records review for patients who had a clinical encounter at the internal medicine resident and cardiology fellow clinics from January to February 2019. To distinguish from adherence with prior guidelines, patients with BP of 130-139/80-89 mmHg (unless age ࣙ60 years and systolic blood pressure [SBP] 140-149 mmHg without chronic kidney disease or diabetes) were included. The primary outcome was accurate assessment of uncontrolled BP in accordance with the 2017 ACC/AHA guidelines. Results: Included in the analysis were 435 patients from the internal medicine resident clinic and 127 patients from the cardiology fellow clinic. Accurate assessment of uncontrolled BP was higher in the cardiology fellow clinic compared to the internal medicine resident clinic (29.1% vs 10.3%, P<0.001), even after adjusting for baseline characteristics differences between the 2 clinics. Multivariate regression analysis revealed that the type of clinic (internal medicine, odds ratio [OR] 0.27, 95% CI 0.16-0.47; P<0.001), established diagnosis of hypertension (OR 2.06, 95% CI 1.06-3.99; P<0.001), and SBP (OR 1.16 per mmHg, 95% CI 1.11-1.22; P=0.031) were independently associated with the primary outcome. Conclusion: Cardiology fellows were better at identifying hypertension diagnosis thresholds and BP treatment goals in accordance with 2017 ACC/AHA guidelines compared to internal medicine residents.