diff --git a/mollom.admin.inc b/mollom.admin.inc
index ae8d9b0..7b558ba 100644
--- a/mollom.admin.inc
+++ b/mollom.admin.inc
@@ -809,6 +809,15 @@ function mollom_admin_settings($form, &$form_state) {
     '#description' => t('Submitting "ham", "unsure", or "spam" on a protected form will trigger the corresponding behavior. Image CAPTCHAs will only respond to "correct" and audio CAPTCHAs only respond to "demo". This option should be disabled in production environments.'),
   );
 
+  $form['mollom_log_minimum_severity'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Only log warnings and errors'),
+    '#return_value' => WATCHDOG_WARNING,
+    '#default_value' => variable_get('mollom_log_minimum_severity', WATCHDOG_WARNING),
+    '#description' => t('Disable to see all Mollom interactions in log messages.'),
+  );
+  $form['#submit'][] = 'mollom_admin_settings_submit';
+
   return system_settings_form($form);
 }
 
@@ -830,6 +839,17 @@ function mollom_admin_settings_validate_key($element, &$form_state) {
 }
 
 /**
+ * Form submission handler for global settings form.
+ */
+function mollom_admin_settings_submit($form, &$form_state) {
+  // If the minimum log severity checkbox was disabled (no input), convert
+  // 0 into WATCHDOG_DEBUG.
+  if (!isset($form_state['input']['mollom_log_minimum_severity'])) {
+    $form_state['values']['mollom_log_minimum_severity'] = WATCHDOG_DEBUG;
+  }
+}
+
+/**
  * Menu callback; Displays the administrative reports page.
  */
 function mollom_reports_page($form, &$form_state) {
diff --git a/mollom.module b/mollom.module
index c9a27d4..420d9dd 100644
--- a/mollom.module
+++ b/mollom.module
@@ -2249,8 +2249,11 @@ function mollom_log_write() {
   if (empty($log)) {
     return;
   }
-  list($message, $arguments) = _mollom_format_log($log);
-  watchdog('mollom', $message, $arguments, $log['severity']);
+  // Only log if severity if it meets configured minimum severity.
+  if ($log['severity'] <= variable_get('mollom_log_minimum_severity', WATCHDOG_WARNING)) {
+    list($message, $arguments) = _mollom_format_log($log);
+    watchdog('mollom', $message, $arguments, $log['severity']);
+  }
 }
 
 /**