Background: AF patients from different clinical settings may have varying outcomes. We aimed to provide patient-level comparisons using two cohorts of patients with AF from different settings. Methods: The clinical characteristics, prescription of OAC, one-year risks of stroke and mortality were compared between patients with AF included into the Darlington AF registry (general practice-based cohort from the United Kingdom, n=2258) and the Gulf SAFE (Survey of atrial fibrillation events) registry (emergency room-based cohort from the Gulf countries, n=1740). Results: Patients from the Gulf SAFE registry were younger, had high prevalence of diabetes, vascular disease, heart failure. Patients from the Darlington registry had higher prevalence of hypertension, previous thromboembolism event, and higher mean stroke risk. OAC use was <60% in high stroke risk patients in both registries. On multivariate analyses, patients from Gulf SAFE were independently associated with higher risks of stroke (odds ratio, 2.18 [1.47-3.23]) and mortality (odds ratio, 1.67 [1.31-2.14]), especially in those with high CHA 2 DS 2-VASc score (≥2 in males, ≥3 in females) (Darlington vs. Gulf SAFE: 3.51% vs. 5.63 for stroke; 11.4% vs. 16.8% for mortality) Conclusions: Differences regarding AF patients profile, OAC use and outcomes exist in varying clinical settings as reflected by registries from different origins. Tailored AF management strategy are needed to fit in different clinical settings.