diff --git a/resources/RemoveInactiveUsersRunner.php b/resources/RemoveInactiveUsersRunner.php
new file mode 100644
index 000000000..dd7065589
--- /dev/null
+++ b/resources/RemoveInactiveUsersRunner.php
@@ -0,0 +1,146 @@
+<?php
+require_once dirname(__FILE__) . "/../lib/Doctrine/bootstrap.php";
+require dirname(__FILE__) . '/../lib/Doctrine/bootstrap_doctrine.php';
+require_once dirname(__FILE__) . '/../lib/Gocdb_Services/User.php';
+require_once dirname(__FILE__) . '/../lib/Gocdb_Services/Factory.php';
+
+// Configure script options
+$longOptions = array(
+    // Required Option. After this many months, users will receive email warnings.
+    "warning_threshold:",
+    // Required Option. After this many months, users will be deleted.
+    "deletion_threshold:",
+);
+
+$options = getopt("", $longOptions);
+
+// Handle the cases where options were not passed.
+
+if (isset($options["warning_threshold"])) {
+    $warningThreshold = $options["warning_threshold"];
+} else {
+    echo "Error: warning_threshold option must be set.\n";
+    usage();
+    return;
+};
+
+if (isset($options["deletion_threshold"])) {
+    $deletionThreshold = $options["deletion_threshold"];
+} else {
+    echo "Error: deletion_threshold option must be set.\n";
+    usage();
+    return;
+};
+
+$dql = "SELECT u FROM User u";
+$users = $entityManager->createQuery($dql)->getResult();
+
+echo "Scanning user login dates in database at: ".date('D, d M Y H:i:s')."\n";
+
+$today = new DateTime();
+
+foreach ($users as $user) {
+    echo 'User ID: ' . $user->getId() . "\n";
+
+    $creationDate = $user->getCreationDate();
+    $creationStr = $creationDate->format('Y-m-d H:i:s');
+
+    $lastLoginDate = $user->getLastLoginDate();
+
+    if (!$user->getAPIAuthenticationEntities()->isEmpty()) {
+       // Prevent creating orphaned API credentials.
+       echo "Cannot delete a user with attached API credentials.\n";
+       // Move onto the next users.
+       continue;
+    }
+
+    if ($lastLoginDate) { // null lastLoginDate check
+        $interval = $today->diff($lastLoginDate);
+    } else { // This might only be run once, since new users always have field filled.
+        echo "User has no lastLoginDate (it may have been a very long time.)\n";
+        echo "Deleting user.\n";
+        deleteUser($user, $entityManager);
+        echo "\n";
+        // Move onto the next users.
+        continue;
+    }
+
+    $elapsedMonths = (int) $interval->format('%a') / 30;
+    echo 'Months elapsed since last login: ' . $elapsedMonths . "\n";
+
+    if ($elapsedMonths > $deletionThreshold) { // Delete user
+        echo "Deleting user\n";
+        deleteUser($user, $entityManager);
+    } elseif ($elapsedMonths > $warningThreshold) { // Warn user
+        echo "Sending user warning email.\n";
+        sendWarningEmail($user, $elapsedMonths, $deletionThreshold);
+    } elseif ($elapsedMonths < $warningThreshold) { // Do Nothing
+        echo "Doing nothing.\n";
+    }
+}
+
+$entityManager->flush();
+echo "Completed ok: ".date('D, d M Y H:i:s');
+
+function usage() {
+    echo "Usage: " .
+         "RemoveInactiveUsersRunner.php " .
+         "--warning_threshold X " .
+         "--deletion_threshold Y" .
+         "\n\n";
+    echo "Options:\n\n";
+    echo "--warning_threshold X " .
+        "    After this many months, users will receive email warnings." .
+        "\n";
+    echo "--deletion_threshold Y" .
+        "    After this many months, users will be deleted." .
+        "\n";
+
+    echo "\n";
+};
+
+function deleteUser($user, $entityManager)
+{
+    $entityManager->getConnection()->beginTransaction();
+    try {
+        $entityManager->remove($user);
+        $entityManager->flush();
+        $entityManager->getConnection()->commit();
+        echo "User deleted.\n";
+    } catch (\Exception $e) {
+        $entityManager->getConnection()->rollback();
+        $entityManager->close();
+        echo "User not deleted.\n";
+        throw $e;
+    }
+}
+
+function sendWarningEmail($user, $elapsedMonths, $deletionThreshold)
+{
+    $emailAddress = $user->getEmail();
+
+    // Email content
+    $headers = "From: GOCDB <gocdb-admins@mailman.egi.eu>";
+    $subject = "GOCDB: User account deletion notice";
+
+    $body = "Dear ". $user->getForename() .",\n\n" .
+            "Your GOCDB account, associated with the following " .
+            "identifiers, has not been signed into during the last " .
+            floor($elapsedMonths) . " months and will be deleted when " .
+            "this period of inactivity reaches " .
+            $deletionThreshold . " months.\n\n";
+
+    $body .= "Identifiers:\n";
+    foreach ($user->getUserIdentifiers() as $identifier) {
+        $body .= "  - " . $identifier->getKeyName() .": " . $identifier->getKeyValue(). "\n";
+    }
+
+    $body .= "\n";
+    $body .= "You can prevent the deletion of this account by visiting the " .
+             "GOCDB portal while authenticated with one of the above " .
+             "identifiers.\n";
+
+
+    // Handle all mail related printing/debugging
+    \Factory::getEmailService()->send($emailAddress, $subject, $body, $headers);
+}