diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92921d36f..19acd732d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Added
 - Webhook proxy security enhancements ([#1398](https://github.com/opendevstack/ods-core/pull/1398/))
+- Add client credentials support to external services templates in the ODS API Service ([#1388](https://github.com/opendevstack/ods-core/pull/1388))
 
 ### Changed
 
diff --git a/ods-api-service/chart/templates/tpl/_application_yaml.tpl b/ods-api-service/chart/templates/tpl/_application_yaml.tpl
index 7f0593274..089c289bf 100644
--- a/ods-api-service/chart/templates/tpl/_application_yaml.tpl
+++ b/ods-api-service/chart/templates/tpl/_application_yaml.tpl
@@ -190,6 +190,8 @@ externalservices:
         bypass:
           audience: ${MARKETPLACE_{{ $name | upper | replace "-" "_" }}_BYPASS_AUDIENCE:}
           scope: ${MARKETPLACE_{{ $name | upper | replace "-" "_" }}_BYPASS_SCOPE:}
+        tenant-id: ${AZURE_{{ $name | upper | replace "-" "_" }}_TENANT_ID:}
+        client-credentials-scope: ${MARKETPLACE_{{ $name | upper | replace "-" "_" }}_CLIENT_CREDENTIALS_SCOPE:}
 {{- end }}
 {{- else }}
     instances: {}
diff --git a/ods-api-service/chart/templates/tpl/_env_application.tpl b/ods-api-service/chart/templates/tpl/_env_application.tpl
index 14e40b716..9a43a8869 100644
--- a/ods-api-service/chart/templates/tpl/_env_application.tpl
+++ b/ods-api-service/chart/templates/tpl/_env_application.tpl
@@ -11,4 +11,7 @@ AZURE_TENANT_ID: {{ .Values.spring.security.obo.azureTenant | b64enc | quote }}
 OBO_TOKEN_URL: {{ .Values.spring.security.obo.tokenUrl | b64enc | quote }}
 OBO_CLIENT_ID: {{ .Values.spring.security.obo.clientId | b64enc | quote }}
 OBO_CLIENT_SECRET: {{ .Values.spring.security.obo.clientSecret | b64enc | quote }}
+CLIENT_CREDENTIALS_TOKEN_URL: {{ .Values.spring.security.clientCredentials.tokenUrl | b64enc | quote }}
+CLIENT_CREDENTIALS_CLIENT_ID: {{ .Values.spring.security.clientCredentials.clientId | b64enc | quote }}
+CLIENT_CREDENTIALS_CLIENT_SECRET: {{ .Values.spring.security.clientCredentials.clientSecret | b64enc | quote }}
 {{- end }}
diff --git a/ods-api-service/chart/templates/tpl/_env_external_services.tpl b/ods-api-service/chart/templates/tpl/_env_external_services.tpl
index a8bc3316e..2bc298b5a 100644
--- a/ods-api-service/chart/templates/tpl/_env_external_services.tpl
+++ b/ods-api-service/chart/templates/tpl/_env_external_services.tpl
@@ -89,6 +89,7 @@ MARKETPLACE_{{ $name | upper | replace "-" "_" }}_TRUST_ALL: {{ $instance.trustA
 MARKETPLACE_{{ $name | upper | replace "-" "_" }}_OBO_SCOPE: {{ $instance.oboScope | quote }}
 MARKETPLACE_{{ $name | upper | replace "-" "_" }}_BYPASS_AUDIENCE: {{ $instance.bypass.audience | default "" | quote }}
 MARKETPLACE_{{ $name | upper | replace "-" "_" }}_BYPASS_SCOPE: {{ $instance.bypass.scope | default "" | quote }}
+MARKETPLACE_{{ $name | upper | replace "-" "_" }}_CLIENT_CREDENTIALS_SCOPE: {{ $instance.clientCredentials | quote }}
 
 {{- end }}
 {{- end }}
@@ -161,6 +162,9 @@ MARKETPLACE_{{ $name | upper | replace "-" "_" }}_USERNAME: {{ $instance.usernam
 {{- if $instance.password }}
 MARKETPLACE_{{ $name | upper | replace "-" "_" }}_PASSWORD: {{ $instance.password | b64enc | quote }}
 {{- end }}
+{{- if $instance.clientCredentialsScope }}
+MARKETPLACE_{{ $name | upper | replace "-" "_" }}_CLIENT_CREDENTIALS_SCOPE: {{ $instance.clientCredentialsScope | b64enc | quote }}
+{{- end }}
 {{- end }}
 {{- end }}