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Choose Reader for view-only access, Contributor for managing Azure resources without assigning Azure RBAC roles, and Owner only when someone must both manage resources and grant Azure access. Then assign the role at the narrowest scope that covers the work. The role determines what actions are allowed; scope determines which resources those actions can affect.
How Owner, Contributor, and Reader differ
| Role | What it allows | When it fits | Key limit |
|---|---|---|---|
| Owner | Manage resources and assign Azure RBAC roles. | Someone who needs both resource-management access and the ability to delegate Azure access at that scope. | Role-assignment authority makes it more consequential than ordinary resource management. |
| Contributor | Manage resources, but not assign Azure RBAC roles. | A resource or platform operator who needs to create and manage resources but does not need to delegate access. | It is broad resource-management access, not access limited to a particular resource type. |
| Reader | View resources without changing them. | Auditing, inventory, or other work that requires visibility but not write access. | It does not include management rights. |
These are broad built-in roles. Their descriptions summarize permitted actions; the scope of a particular role assignment still determines where those actions apply. Microsoft lists the built-in roles in its Azure built-in roles reference.
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Choose the scope as carefully as the role
Azure RBAC assignments can apply at a management group, subscription, resource group, or individual resource. These scopes form a hierarchy: access assigned at a parent scope is inherited by resources beneath it. For example, a subscription-level Reader assignment reaches resources across that subscription, while a Contributor assignment on one resource group does not by itself apply to sibling groups.
Prefer the smallest scope that covers the task. Microsoft’s scope guidance uses a managed identity that needs access to one storage account as an example: assign the role at the storage-account scope rather than at the resource-group or subscription scope.
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Which role should you assign?
- Identify the identity and task. The security principal may be a user, group, service principal, or managed identity. Define what it needs to do before choosing a role.
- Check for a narrower role. A resource-specific built-in role may grant the required actions without the breadth of Owner, Contributor, or Reader. Microsoft also supports custom roles when built-in roles do not meet a specific need; see the built-in roles reference and custom roles guidance.
- Select the least powerful suitable role. Use Reader for view-only work, Contributor for resource management without Azure RBAC role assignment, and Owner only when both resource management and role delegation are required.
- Set the smallest workable scope. Apply the assignment only where the task requires access, then account for other assignments inherited from parent scopes.
Microsoft’s role-assignment guidance states: “It’s a best practice to grant security principals the least privilege they need to perform their job.” See Microsoft’s role-assignment guidance.
Why a Reader assignment may not make access read-only
Azure RBAC permissions are additive. Effective access combines applicable assignments; a Reader role does not cancel a Contributor assignment inherited from a subscription or granted elsewhere. Microsoft illustrates this in its role assignments overview: a user with Contributor at subscription scope and Reader on a resource group still has the broader inherited Contributor access in that group.
When access seems broader or narrower than expected, inspect both direct and inherited assignments. An assignment is made up of a security principal, a role definition, and a scope, so check all three: who received it, which actions the role permits, and which resources the scope covers. The Azure RBAC overview explains how assignments and effective access work.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Owner is also an access-delegation decision
Owner is not simply a stronger version of Contributor: it includes the ability to assign Azure RBAC roles. Microsoft also identifies User Access Administrator as a role with role-assignment capability. Giving someone delegation authority can let them grant powerful roles to others, so consider whether they need that authority at all and how broadly it should apply.
For cases where delegation is necessary but should be constrained, Microsoft describes using Azure attribute-based access control (Azure ABAC) conditions to limit which role assignments a delegate can create or delete. See the role-assignment delegation overview.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Azure resource roles are not Microsoft Entra directory roles
Azure RBAC governs access to Azure resources. Microsoft Entra roles govern directory resources such as users, groups, and domains. Assigning Azure Owner or Contributor does not, by itself, give someone a corresponding Microsoft Entra administrator role. Microsoft explains the distinction in its Microsoft Entra roles and permissions reference.
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