AWS Organizational Hierarchy AWS Organizations "must" be the starting point of your AWS deployment. (unless you are absolutely sure that it won't scale.. highly unlikely!!) An AWS Organization comprises of multiple "Organizational Units (OUs)". OUs comprise of other OUs or member "AWS Accounts". Image credits : Here Tip : Design the OUs such that they complement with your organizational hierarchy and businesses and sub-divisions. For eg. Company XYZ maps to an AWS Organization, -- Finance maps an OU, -- Investment Banking within Finance maps to a sub-OU -- Investment Banking Prod environment maps to an AWS Account -- Investment Banking Non-Prod environment gets another AWS Account -- Investment Banking Dev environment gets another AWS Account -- Fixed Income within Finance maps to another sub-OU -- Retail within Finance maps to another sub-OU and so on... OUs insid