diff --git a/wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/templates/certificates/template-generate-certificates.php b/wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/templates/certificates/template-generate-certificates.php
index 37876d43..78f86d44 100644
--- a/wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/templates/certificates/template-generate-certificates.php
+++ b/wordpress-dev/wordpress/wp-content/plugins/hvac-community-events/templates/certificates/template-generate-certificates.php
@@ -72,6 +72,14 @@ try {
                 $event_id
             ));
             
+            // Check certificate status for each attendee
+            if (!empty($attendees) && class_exists('HVAC_Certificate_Manager')) {
+                $certificate_manager = HVAC_Certificate_Manager::instance();
+                foreach ($attendees as $attendee) {
+                    $attendee->has_certificate = $certificate_manager->certificate_exists($event_id, $attendee->attendee_id);
+                }
+            }
+            
             // Log for debugging if needed
             if (defined('WP_DEBUG') && WP_DEBUG) {
                 error_log('Generate Certificates - Event ID: ' . $event_id . ', Attendees: ' . count($attendees));
@@ -143,6 +151,22 @@ get_header();
                         <input type="hidden" name="event_id" value="<?php echo esc_attr($event_id); ?>">
                         <input type="hidden" name="generate_certificates" value="1">
                         
+                        <?php 
+                        // Count attendees with certificates
+                        $has_certificate_count = 0;
+                        foreach ($attendees as $attendee) {
+                            if (!empty($attendee->has_certificate)) {
+                                $has_certificate_count++;
+                            }
+                        }
+                        
+                        if ($has_certificate_count > 0) : ?>
+                            <div class="hvac-notice hvac-notice-info">
+                                <p><strong>Note:</strong> <?php echo $has_certificate_count; ?> attendee(s) already have certificates. These will be skipped to prevent duplicates.</p>
+                                <p>Attendees with existing certificates are marked with ✓ and cannot be selected.</p>
+                            </div>
+                        <?php endif; ?>
+                        
                         <div class="hvac-form-group">
                             <div class="hvac-table-actions">
                                 <button type="button" class="hvac-button hvac-secondary" id="select-all-attendees">Select All</button>
@@ -160,6 +184,7 @@ get_header();
                                             <th>Attendee Name</th>
                                             <th>Email</th>
                                             <th>Check-in Status</th>
+                                            <th>Certificate Status</th>
                                         </tr>
                                     </thead>
                                     <tbody>
@@ -170,14 +195,20 @@ get_header();
                                             $status_text = $checked_in ? 'Checked In' : 'Not Checked In';
                                             $attendee_name = $attendee->holder_name ?: 'Unknown';
                                             $attendee_email = $attendee->holder_email ?: 'No email';
+                                            $has_certificate = !empty($attendee->has_certificate);
+                                            $cert_status_class = $has_certificate ? 'hvac-has-certificate' : '';
                                         ?>
-                                            <tr class="<?php echo esc_attr($checked_in_class); ?>">
+                                            <tr class="<?php echo esc_attr($checked_in_class . ' ' . $cert_status_class); ?>">
                                                 <td>
-                                                    <input type="checkbox" 
-                                                           name="attendee_ids[]" 
-                                                           value="<?php echo esc_attr($attendee->attendee_id); ?>" 
-                                                           class="attendee-checkbox" 
-                                                           <?php echo $checked_in ? 'checked' : ''; ?>>
+                                                    <?php if (!$has_certificate) : ?>
+                                                        <input type="checkbox" 
+                                                               name="attendee_ids[]" 
+                                                               value="<?php echo esc_attr($attendee->attendee_id); ?>" 
+                                                               class="attendee-checkbox" 
+                                                               <?php echo $checked_in ? 'checked' : ''; ?>>
+                                                    <?php else : ?>
+                                                        <span class="hvac-certificate-exists" title="Certificate already generated">✓</span>
+                                                    <?php endif; ?>
                                                 </td>
                                                 <td><?php echo esc_html($attendee_name); ?></td>
                                                 <td><?php echo esc_html($attendee_email); ?></td>
@@ -186,6 +217,13 @@ get_header();
                                                         <?php echo esc_html($status_text); ?>
                                                     </span>
                                                 </td>
+                                                <td>
+                                                    <?php if ($has_certificate) : ?>
+                                                        <span class="hvac-status-has-certificate">Certificate Issued</span>
+                                                    <?php else : ?>
+                                                        <span class="hvac-status-no-certificate">No Certificate</span>
+                                                    <?php endif; ?>
+                                                </td>
                                             </tr>
                                         <?php endforeach; ?>
                                     </tbody>