diff --git a/merge_ticket_modal.php b/merge_ticket_modal.php
new file mode 100644
index 00000000..99259185
--- /dev/null
+++ b/merge_ticket_modal.php
@@ -0,0 +1,102 @@
+<div class="modal" id="mergeTicketModal<?php echo $ticket_id; ?>" tabindex="-1">
+    <div class="modal-dialog modal-md">
+        <div class="modal-content bg-dark">
+            <div class="modal-header">
+                <h5 class="modal-title"><i class="fa fa-fw fa-tag"></i> Merge & Close <?php echo "$ticket_prefix$ticket_number"; ?> into another ticket</h5>
+                <button type="button" class="close text-white" data-dismiss="modal">
+                    <span>&times;</span>
+                </button>
+            </div>
+            <form action="post.php" method="post" autocomplete="off">
+                <input type="hidden" id="current_ticket_id" name="ticket_id" value="<?php echo $ticket_id; ?>">
+                <div class="modal-body bg-white">
+
+                    <div class="form-group">
+                        <label>Ticket number to merge this ticket into <strong class="text-danger">*</strong></label>
+                        <div class="input-group">
+                            <div class="input-group-prepend">
+                                <?php
+                                // Show the ticket prefix, or just the tag icon
+                                if(empty($ticket_prefix)){
+                                    echo "<span class=\"input-group-text\"><i class=\"fa fa-fw fa-tag\"></i></span>";
+                                }
+                                else{
+                                    echo "<div class=\"input-group-text\"> $ticket_prefix </div>";
+                                }
+                                ?>
+                            </div>
+                            <input type="text" class="form-control" id="merge_into_ticket_number" name="merge_into_ticket_number" placeholder="Ticket number" required onfocusout="merge_into_number_get_details()">
+                            <!-- Calls Javascript function merge_into_number_get_details() after leaving intput field -->
+                        </div>
+                    </div>
+
+                    <div class="form-group">
+                        <label>Reason for merge <strong class="text-danger">*</strong></label>
+                        <div class="input-group">
+                            <div class="input-group-prepend">
+                                <span class="input-group-text"><i class="fa fa-fw fa-sticky-note"></i></span>
+                            </div>
+                            <input type="text" class="form-control" name="merge_comment" placeholder="Comments" required>
+                        </div>
+                    </div>
+
+                    <hr>
+                    <div class="form-group" id="merge_into_details_div" hidden>
+                        <h5 id="merge_into_details_number"></h5>
+                        <p id="merge_into_details_client"></p>
+                        <p id="merge_into_details_subject"></p>
+                        <p id="merge_into_details_priority"></p>
+                        <p id="merge_into_details_status"></p>
+                    </div>
+
+                </div>
+                <div class="modal-footer bg-white">
+                    <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>
+                    <button type="submit" id="merge_ticket_btn" name="merge_ticket" class="btn btn-primary" disabled>Merge</button>
+                    <!-- Merge button starts disabled. Is enabled by the merge_into_number_get_details Javascript function-->
+                </div>
+            </form>
+        </div>
+    </div>
+</div>
+
+<script>
+    //Gets details of the ticket we're going to merge this ticket into
+    //Shows the details under the comments box & enables the merge button if the status of the merge into ticket is not closed
+    function merge_into_number_get_details() {
+
+        //Get the ticket number to merge into
+        var merge_into_ticket_number = document.getElementById("merge_into_ticket_number").value;
+
+        //Reset the form
+        document.getElementById("merge_ticket_btn").disabled = true;
+        document.getElementById("merge_into_details_div").hidden = true;
+
+        //Send a GET request to post.php as post.php?merge_ticket_get_json_details=true&merge_into_ticket_number=NUMBER
+        jQuery.get(
+            "post.php",
+            {merge_ticket_get_json_details: 'true', merge_into_ticket_number: merge_into_ticket_number},
+            function(data){
+                //If we get a response from post.php, parse it as JSON
+                const merge_into_ticket_info = JSON.parse(data);
+
+                //Check that the current ticket ID isn't also the new/merge ticket ID
+                if(parseInt(merge_into_ticket_info.ticket_id) !== parseInt(document.getElementById("current_ticket_id").value)){
+
+                    //Show the div with the master ticket details, populate
+                    document.getElementById("merge_into_details_div").hidden = false;
+                    document.getElementById("merge_into_details_number").innerText = "Master ticket details: " + merge_into_ticket_info.ticket_prefix + merge_into_ticket_info.ticket_number;
+                    document.getElementById("merge_into_details_client").innerText = "Client Contact: " + merge_into_ticket_info.client_name + " / " + merge_into_ticket_info.contact_name;
+                    document.getElementById("merge_into_details_subject").innerText = "Subject: " + merge_into_ticket_info.ticket_subject;
+                    document.getElementById("merge_into_details_priority").innerText = "Priority: " + merge_into_ticket_info.ticket_priority;
+                    document.getElementById("merge_into_details_status").innerText = "Status: " + merge_into_ticket_info.ticket_status;
+
+                    //Enable the merge button if the merge into ticket isn't in a closed state
+                    if(merge_into_ticket_info.ticket_status.toLowerCase() != "closed"){
+                        document.getElementById("merge_ticket_btn").disabled = false;
+                    }
+                }
+            }
+        );
+    }
+</script>
\ No newline at end of file
diff --git a/post.php b/post.php
index 75cd93fd..c043073d 100644
--- a/post.php
+++ b/post.php
@@ -5142,6 +5142,74 @@ if(isset($_GET['archive_ticket_reply'])){
   
 }
 
+if(isset($_GET['merge_ticket_get_json_details'])){
+    $merge_into_ticket_number = intval($_GET['merge_into_ticket_number']);
+
+    $sql = mysqli_query($mysqli,"SELECT * FROM tickets
+      LEFT JOIN clients ON ticket_client_id = client_id 
+      LEFT JOIN contacts ON ticket_contact_id = contact_id
+      WHERE ticket_number = '$merge_into_ticket_number' AND tickets.company_id = '$session_company_id'");
+
+    if(mysqli_num_rows($sql) == 0){
+        //Do nothing.
+    }
+    else {
+        //Return ticket, client and contact details for the given ticket number
+        $row = mysqli_fetch_array($sql);
+        echo json_encode($row);
+    }
+}
+
+if(isset($_POST['merge_ticket'])){
+    $ticket_id = intval($_POST['ticket_id']);
+    $merge_into_ticket_number = intval($_POST['merge_into_ticket_number']);
+    $merge_comment = trim(mysqli_real_escape_string($mysqli,$_POST['merge_comment']));
+    $ticket_reply_type = 'Internal';
+
+    //Get current ticket details
+    $sql = mysqli_query($mysqli, "SELECT ticket_prefix, ticket_number, ticket_subject, ticket_details FROM tickets WHERE ticket_id = '$ticket_id'");
+    if(mysqli_num_rows($sql) == 0){
+        $_SESSION['alert_message'] = "No ticket with that ID found.";
+        header("Location: " . $_SERVER["HTTP_REFERER"]);
+        exit();
+    }
+    $row = mysqli_fetch_array($sql);
+    $ticket_prefix = trim(mysqli_real_escape_string($mysqli,$row['ticket_prefix']));
+    $ticket_number = trim(mysqli_real_escape_string($mysqli,$row['ticket_number']));
+    $ticket_subject = trim(mysqli_real_escape_string($mysqli,$row['ticket_subject']));
+    $ticket_details = trim(mysqli_real_escape_string($mysqli,$row['ticket_details']));
+
+    //Get merge into ticket id (as it may differ from the number)
+    $sql = mysqli_query($mysqli, "SELECT ticket_id FROM tickets WHERE ticket_number = '$merge_into_ticket_number'");
+    if(mysqli_num_rows($sql) == 0){
+        $_SESSION['alert_message'] = "Cannot merge into that ticket.";
+        header("Location: " . $_SERVER["HTTP_REFERER"]);
+        exit();
+    }
+    $merge_row = mysqli_fetch_array($sql);
+    $merge_into_ticket_id = trim(mysqli_real_escape_string($mysqli,$merge_row['ticket_id']));
+
+    if($ticket_number == $merge_into_ticket_number){
+        $_SESSION['alert_message'] = "Cannot merge into the same ticket.";
+        header("Location: " . $_SERVER["HTTP_REFERER"]);
+        exit();
+    }
+
+    //Update current ticket
+    mysqli_query($mysqli,"INSERT INTO ticket_replies SET ticket_reply = 'Ticket $ticket_prefix$ticket_number merged into $ticket_prefix$merge_into_ticket_number. Comment: $merge_comment', ticket_reply_time_worked = '00:01:00', ticket_reply_type = '$ticket_reply_type', ticket_reply_created_at = NOW(), ticket_reply_by = $session_user_id, ticket_reply_ticket_id = $ticket_id, company_id = $session_company_id") or die(mysqli_error($mysqli));
+    mysqli_query($mysqli,"UPDATE tickets SET ticket_status = 'Closed', ticket_updated_at = NOW() WHERE ticket_id = $ticket_id AND company_id = $session_company_id") or die(mysqli_error($mysqli));
+
+    //Update new ticket
+    mysqli_query($mysqli,"INSERT INTO ticket_replies SET ticket_reply = 'Ticket $ticket_prefix$ticket_number was merged into this ticket with comment: $merge_comment.<br><b>$ticket_subject</b><br>$ticket_details', ticket_reply_time_worked = '00:01:00', ticket_reply_type = '$ticket_reply_type', ticket_reply_created_at = NOW(), ticket_reply_by = $session_user_id, ticket_reply_ticket_id = $merge_into_ticket_id, company_id = $session_company_id") or die(mysqli_error($mysqli));
+
+    //Logging
+    mysqli_query($mysqli,"INSERT INTO logs SET log_type = 'Ticket', log_action = 'Merged', log_description = 'Merged ticket $ticket_prefix$ticket_number into $ticket_prefix$merge_into_ticket_number', log_created_at = NOW(), company_id = $session_company_id, log_user_id = $session_user_id");
+
+    $_SESSION['alert_message'] = "Ticket merged into $ticket_prefix$merge_into_ticket_number.";
+    header("Location: " . $_SERVER["HTTP_REFERER"]);
+
+}
+
 if(isset($_GET['close_ticket'])){
 
     $ticket_id = intval($_GET['close_ticket']);
diff --git a/ticket.php b/ticket.php
index 028be442..ebcd8ab4 100644
--- a/ticket.php
+++ b/ticket.php
@@ -148,6 +148,7 @@ if(isset($_GET['ticket_id'])){
       </button>
       <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
         <a class="dropdown-item" href="#" data-toggle="modal" data-target="#editTicketModal<?php echo $ticket_id; ?>">Edit</a>
+        <a class="dropdown-item" href="#" data-toggle="modal" data-target="#mergeTicketModal<?php echo $ticket_id; ?>">Merge</a>
         <div class="dropdown-divider"></div>
         <a class="dropdown-item text-danger" href="post.php?delete_ticket=<?php echo $ticket_id; ?>">Delete</a>
       </div>
@@ -449,7 +450,10 @@ if(isset($_GET['ticket_id'])){
 
 </div>
 
-<?php include("edit_ticket_modal.php"); ?>
+<?php
+      include("edit_ticket_modal.php");
+      include("merge_ticket_modal.php");
+?>
 
 <?php