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Objective: Access to acute stroke unit (ASU) care is known to vary worldwide. We aimed to quantify regional variations in the various components of ASU care., Method: Secondary analysis of the Head Positioning in acute Stroke Trial (HeadPoST), an international, multicentre, cluster crossover trial of head-up versus head-down positioning in 11,093 acute stroke patients at 114 hospitals in 9 countries. Patients characteristics and 11 standard components of processes of care were described according to ASU admission within and across four economically-defined regional groups (Australia/UK, China [includes Taiwan], India/Sri Lanka, and South America [Brazil/Chile/Colombia]). Variations in process of ASU care estimates were obtained in hierarchical mixed models, with adjustment for study design and potential patient- and hospital-level confounders., Results: Of 11,086 patients included in analyses, 59.7% (n = 6620) had an ASU admission. In China, India/Sri Lanka and South America, ASU patients were older, had greater neurological severity and more premorbid conditions than non-ASU patients. ASU patients were more likely to receive reperfusion therapy and multidisciplinary care within regions, but the components of care varied across regions. With Australia/UK as reference, patients in other regions had a lower probability of receiving reperfusion therapy, especially in India/Sri Lanka (adjusted odds ratio [aOR] 0.27, 95% confidence interval [CI] 0.12-0.63) and multidisciplinary care (mainly in formal dysphagia assessment, physiotherapy and occupational therapy)., Conclusion: There is significant variation in the components of stroke care across economically-defined regions of the world. Ongoing efforts are required to reduce disparities and optimise health outcomes, especially in resource poor areas., Clinical Trial Registration: HeadPoST is registered at ClinicalTrials.gov (NCT02162017)., (Copyright © 2020 The Author(s). Published by Elsevier B.V. All rights reserved.)