diff --git a/src/main/java/org/ligoj/app/plugin/id/ldap/dao/ProjectCustomerLdapRepository.java b/src/main/java/org/ligoj/app/plugin/id/ldap/dao/ProjectCustomerLdapRepository.java
index d871e02..ab0cb0e 100644
--- a/src/main/java/org/ligoj/app/plugin/id/ldap/dao/ProjectCustomerLdapRepository.java
+++ b/src/main/java/org/ligoj/app/plugin/id/ldap/dao/ProjectCustomerLdapRepository.java
@@ -3,14 +3,7 @@
  */
 package org.ligoj.app.plugin.id.ldap.dao;
 
-import java.util.Set;
-import java.util.stream.Collectors;
-
-import javax.cache.annotation.CacheKey;
-import javax.cache.annotation.CachePut;
-import javax.cache.annotation.CacheResult;
-import javax.cache.annotation.CacheValue;
-
+import lombok.extern.slf4j.Slf4j;
 import org.ligoj.app.iam.IamProvider;
 import org.ligoj.app.plugin.id.DnUtils;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -21,7 +14,9 @@
 import org.springframework.ldap.filter.EqualsFilter;
 import org.springframework.stereotype.Component;
 
-import lombok.extern.slf4j.Slf4j;
+import javax.cache.annotation.*;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 import static org.ligoj.app.plugin.id.ldap.dao.AbstractManagedLdapRepository.OBJECT_CLASS;
 
@@ -72,7 +67,7 @@ public String findById(@CacheKey final String baseDn, @CacheKey final String id)
 	}
 
 	/**
-	 * Create a new group. There is no synchronized block, so error could occur; this is assumed for performance
+	 * Create a new organizational unit. There is no synchronized block, so error could occur; this is assumed for performance
 	 * purpose.
 	 *
 	 * @param baseDn Base DN.
@@ -92,6 +87,23 @@ public void create(@CacheKey final String baseDn, @CacheKey final String ou, @Ca
 		getUser().getTemplate().bind(context);
 	}
 
+	/**
+	 * Delete the given organizational unit.
+	 *
+	 * @param baseDn Base DN.
+	 * @param ou     The formatted OU.
+	 * @param dn     The DN of new customer. Must ends with the OU.
+	 */
+	@CacheRemove(cacheName = "customers-by-id")
+	public void delete(@CacheKey final String baseDn, @CacheKey final String ou, final String dn) {
+		// Invalidate the customers set
+		cacheManager.getCache("customers").evict(baseDn);
+
+		// First create the LDAP entry
+		log.info("Customer (OU) {} will be delete from {}", ou, dn);
+		getUser().getTemplate().unbind(dn);
+	}
+
 	/**
 	 * Map a customer to LDAP.
 	 *
diff --git a/src/main/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResource.java b/src/main/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResource.java
index 8bebdfc..d20bdd3 100644
--- a/src/main/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResource.java
+++ b/src/main/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResource.java
@@ -435,6 +435,17 @@ private String validateAndCreateParent(final String group, final String parentGr
 		return validateParentGroup(group, parentGroup);
 	}
 
+	/**
+	 * Return the normalized OU DN.
+	 */
+	private String getParentOu(final String ou) {
+		final var groupTypeLdap = containerScopeResource.findByName(ContainerType.GROUP, ContainerScope.TYPE_PROJECT);
+		final var parentDn = groupTypeLdap.getDn();
+
+		// Build the complete normalized DN from the OU and new Group
+		return "ou=" + ou + "," + parentDn;
+	}
+
 	/**
 	 * Validate the group against its direct parent (a normalized OU) and return its DN.
 	 */
@@ -443,7 +454,7 @@ private String validateAndCreateParentOu(final String group, final String ou, fi
 		final var parentDn = groupTypeLdap.getDn();
 
 		// Build the complete normalized DN from the OU and new Group
-		final var ouDn = "ou=" + ou + "," + parentDn;
+		final var ouDn = getParentOu(ou);
 
 		// Check the target OU exists or not and create the OU as needed
 		if (projectCustomerLdapRepository.findById(parentDn, ou) == null) {
@@ -738,7 +749,8 @@ public Collection<INamableBean<String>> findCustomersByName(@PathParam("criteria
 
 	@Override
 	public void delete(final int subscription, final boolean deleteRemoteData) {
-		final var projectId = subscriptionRepository.findOne(subscription).getProject().getId();
+		final var project = subscriptionRepository.findOne(subscription).getProject();
+		final var projectId = project.getId();
 		final var parameters = subscriptionResource.getParameters(subscription);
 		final var group = parameters.get(IdentityResource.PARAMETER_GROUP);
 		cacheProjectGroupRepository.deleteAllBy("group.id", group, new String[]{"project.id"}, projectId);
@@ -751,6 +763,19 @@ public void delete(final int subscription, final boolean deleteRemoteData) {
 				// Perform the deletion
 				repository.delete(groupLdap);
 			}
+
+			// Also try to delete the parent OU. Ignore the failures.
+			final var ou = parameters.get(IdentityResource.PARAMETER_OU);
+			if (ou != null) {
+				final var groupTypeLdap = containerScopeResource.findByName(ContainerType.GROUP, ContainerScope.TYPE_PROJECT);
+				try {
+					projectCustomerLdapRepository.delete(groupTypeLdap.getDn(), ou, getParentOu(ou));
+					log.info("OU {} has been cleaned, after deleting group {}, project {} and subscription {}", ou, group, project.getPkey(), subscription);
+				} catch (Exception e) {
+					// Ignore this failure, this OU might not be empty
+					log.info("OU {} could not be deleted while deleting group {}, project {} and subscription {}", ou, group, project.getPkey(), subscription);
+				}
+			}
 		}
 	}
 
diff --git a/src/test/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResourceTest.java b/src/test/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResourceTest.java
index ad12575..576a7dc 100644
--- a/src/test/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResourceTest.java
+++ b/src/test/java/org/ligoj/app/plugin/id/ldap/resource/LdapPluginResourceTest.java
@@ -301,7 +301,22 @@ void createOuNotExists() {
 		Assertions.assertNotNull(projectCustomerLdapRepository.findById("ou=project,dc=sample,dc=com", "some"));
 		Assertions.assertTrue(projectCustomerLdapRepository.findAll("ou=project,dc=sample,dc=com").contains("some"));
 
+		// Attach the new group
+		final var subscription3 = new Subscription();
+		subscription3.setProject(subscription2.getProject());
+		subscription3.setNode(subscription.getNode());
+		em.persist(subscription3);
+
+		// Add parameters
+		setGroup(subscription3, "some-new-project-sub");
+		setOu(subscription3, "some");
+		basicCreate(subscription3);
+
+		// Delete the group, and also try to delete the parent OU. This last step fail silently
 		resource.delete(subscription2.getId(), true);
+
+		// Delete the group, and also delete sucessfully the parent
+		resource.delete(subscription3.getId(), true);
 	}
 
 	@Test