diff --git a/modules/commerce_coupon/commerce_coupon.rules.inc b/modules/commerce_coupon/commerce_coupon.rules.inc
index 201c79a..8c8ee10 100644
--- a/modules/commerce_coupon/commerce_coupon.rules.inc
+++ b/modules/commerce_coupon/commerce_coupon.rules.inc
@@ -50,6 +50,36 @@ function commerce_coupon_rules_event_info() {
 }
 
 /**
+ * Implements hook_rules_condition_info().
+ */
+function commerce_coupon_rules_condition_info() {
+  $conditions = array();
+
+  $conditions['commerce_coupon_compare_coupon'] = array(
+    'label' => t('Coupon line item exists'),
+    'parameter' => array(
+      'commerce_order' => array(
+        'type' => 'commerce_order',
+        'label' => t('Order'),
+        'description' => t('The order whose line items should be checked for an existing coupon line item.'),
+      ),
+      'coupon' => array(
+        'type' => 'text',
+        'label' => t('Coupon'),
+        'options list' => 'commerce_coupon_coupons_options_list',
+        'description' => t('Limit the search amongst the coupon line items to a particular coupon.'),
+      ),
+    ),
+    'group' => t('Commerce Coupon'),
+    'callbacks' => array(
+      'execute' => 'commerce_coupon_rules_line_item_exists',
+    ),
+  );
+
+  return $conditions;
+}
+
+/**
  * Implements hook_rules_action_info().
  */
 function commerce_coupon_rules_action_info() {
@@ -159,6 +189,59 @@ function commerce_coupon_rules_action_info() {
   return $actions;
 }
 
+/**
+ * Checks an order for the existence of a coupon line item.
+ *
+ * @param $order
+ *   The order to check for a coupon line item.
+ * @param $coupon
+ *   The machine-name of a particular coupon to search for; if '-any-'
+ *   the condition returns TRUE for any found coupon line item.
+ */
+function commerce_coupon_rules_line_item_exists($order, $coupon) {
+  $order_wrapper = entity_metadata_wrapper('commerce_order', $order);
+
+  // Loop over all the line items on the order.
+  foreach ($order_wrapper->commerce_line_items as $delta => $line_item_wrapper) {
+    // If the current line item is a coupon line item and the condition either
+    // doesn't care about the coupon or the coupon name matches, return TRUE.
+    if ($line_item_wrapper->type->value() == 'coupon' &&
+      ($coupon == '-any-' || $line_item_wrapper->commerce_coupon_reference->value() == $coupon)) {
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+/**
+ * Returns a list of coupons available for existence conditions.
+ */
+function commerce_coupon_coupons_options_list() {
+  // Return an options array with an "Any" option prefixed to the list of existing coupon options.
+  return array_merge(array('-any-' => t('Any')), commerce_coupon_options_list());
+}
+
+/**
+ * Return list of defined coupons as an array of all coupon codes keyed by the coupon id.
+ * @todo: complete this function.
+ */
+function commerce_coupon_options_list() {
+  $result = db_query("SELECT coupon_id FROM {commerce_coupon}");
+
+  $coupon_ids = array();
+  foreach ($result as $coupon) {
+    $coupon_ids[] = $coupon->coupon_id;
+  }
+
+  $coupons = commerce_coupon_load_multiple($coupon_ids);
+  $coupon_options = array();
+  foreach ($coupons as $coupon) {
+    $coupon_options[$coupon->coupon_id] = $coupon->commerce_coupon_code[LANGUAGE_NONE][0]['safe_value'];
+  }
+
+  return $coupon_options;
+}
 
 function commerce_coupon_action_is_valid_coupon($override = FALSE) {
   $validation_results = &drupal_static('commerce_coupon_action_validation_results');