diff --git a/changelogs/fragments/929-vault-namespace-support.yml b/changelogs/fragments/929-vault-namespace-support.yml
new file mode 100644
index 0000000000..bf22978aff
--- /dev/null
+++ b/changelogs/fragments/929-vault-namespace-support.yml
@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - hashi_vault - support ``VAULT_NAMESPACE`` environment variable for namespaced lookups against Vault Enterprise (in addition to the ``namespace=`` flag supported today) (https://github.com/ansible-collections/community.general/pull/929).
diff --git a/plugins/lookup/hashi_vault.py b/plugins/lookup/hashi_vault.py
index 3cff19d939..5ace528e44 100644
--- a/plugins/lookup/hashi_vault.py
+++ b/plugins/lookup/hashi_vault.py
@@ -117,6 +117,9 @@ DOCUMENTATION = """
       default: True
     namespace:
       description: Namespace where secrets reside. Requires HVAC 0.7.0+ and Vault 0.11+.
+      env:
+        - name: VAULT_NAMESPACE
+          version_added: 1.2.0
     aws_profile:
         description: The AWS profile
         type: str