diff --git a/InvenTree/order/forms.py b/InvenTree/order/forms.py
index c7942e3549..4844ef4344 100644
--- a/InvenTree/order/forms.py
+++ b/InvenTree/order/forms.py
@@ -6,6 +6,7 @@ Django Forms for interacting with Order objects
 from __future__ import unicode_literals
 
 from django import forms
+from django.utils.translation import ugettext as _
 
 from InvenTree.forms import HelperForm
 
@@ -14,7 +15,7 @@ from .models import PurchaseOrder, PurchaseOrderLineItem
 
 class IssuePurchaseOrderForm(HelperForm):
 
-    confirm = forms.BooleanField(required=False, help_text='Place order')
+    confirm = forms.BooleanField(required=False, help_text=_('Place order'))
 
     class Meta:
         model = PurchaseOrder
@@ -23,6 +24,17 @@ class IssuePurchaseOrderForm(HelperForm):
         ]
 
 
+class CancelPurchaseOrderForm(HelperForm):
+
+    confirm = forms.BooleanField(required=False, help_text=_('Cancel order'))
+
+    class Meta:
+        model = PurchaseOrder
+        fields = [
+            'confirm',
+        ]
+        
+
 class EditPurchaseOrderForm(HelperForm):
     """ Form for editing a PurchaseOrder object """
 
diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index 9eff4d11c3..de0ac86bad 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -98,6 +98,13 @@ class Order(models.Model):
             self.complete_date = datetime.now().date()
             self.save()
 
+    def cancel_order(self):
+        """ Marks the order as CANCELLED. """
+
+        if self.status in [OrderStatus.PLACED, OrderStatus.PENDING]:
+            self.status = OrderStatus.CANCELLED
+            self.save()
+
 
 class PurchaseOrder(Order):
     """ A PurchaseOrder represents goods shipped inwards from an external supplier.
diff --git a/InvenTree/order/templates/order/order_cancel.html b/InvenTree/order/templates/order/order_cancel.html
new file mode 100644
index 0000000000..3c71028b06
--- /dev/null
+++ b/InvenTree/order/templates/order/order_cancel.html
@@ -0,0 +1,7 @@
+{% extends "modal_form.html" %}
+
+{% block pre_form_content %}
+
+Cancelling this order means that the order will no longer be editable.
+
+{% endblock %}
\ No newline at end of file
diff --git a/InvenTree/order/templates/order/purchase_order_detail.html b/InvenTree/order/templates/order/purchase_order_detail.html
index 2ddbdc3052..29336b18db 100644
--- a/InvenTree/order/templates/order/purchase_order_detail.html
+++ b/InvenTree/order/templates/order/purchase_order_detail.html
@@ -43,6 +43,11 @@ InvenTree | {{ order }}
                                 <span class='glyphicon glyphicon-check'></span>
                             </button>
                             {% endif %}
+                            {% if order.status == OrderStatus.PENDING or order.status == OrderStatus.PLACED %}
+                            <button type='button' class='btn btn-default btn-glyph' id='cancel-order' title='Cancel order'>
+                                <span class='glyphicon glyphicon-remove'></span>
+                            </button>
+                            {% endif %}
                         </div>
                     </div>
                 </p>
@@ -176,6 +181,12 @@ $("#edit-order").click(function() {
     );
 });
 
+$("#cancel-order").click(function() {
+    launchModalForm("{% url 'purchase-order-cancel' order.id %}", {
+        reload: true,
+    });
+});
+
 $("#receive-order").click(function() {
     launchModalForm("{% url 'purchase-order-receive' order.id %}", {
         reload: true,
diff --git a/InvenTree/order/urls.py b/InvenTree/order/urls.py
index 38687342c2..994e6b054d 100644
--- a/InvenTree/order/urls.py
+++ b/InvenTree/order/urls.py
@@ -11,6 +11,7 @@ from . import views
 
 purchase_order_detail_urls = [
 
+    url(r'^cancel/?', views.PurchaseOrderCancel.as_view(), name='purchase-order-cancel'),
     url(r'^edit/?', views.PurchaseOrderEdit.as_view(), name='purchase-order-edit'),
     url(r'^issue/?', views.PurchaseOrderIssue.as_view(), name='purchase-order-issue'),
     url(r'^receive/?', views.PurchaseOrderReceive.as_view(), name='purchase-order-receive'),
diff --git a/InvenTree/order/views.py b/InvenTree/order/views.py
index 86a231075e..49d2ed01ed 100644
--- a/InvenTree/order/views.py
+++ b/InvenTree/order/views.py
@@ -112,6 +112,39 @@ class PurchaseOrderEdit(AjaxUpdateView):
         return form
 
 
+class PurchaseOrderCancel(AjaxUpdateView):
+    """ View for cancelling a purchase order """
+
+    model = PurchaseOrder
+    ajax_form_title = 'Cancel Order'
+    ajax_template_name = 'order/order_cancel.html'
+    form_class = order_forms.CancelPurchaseOrderForm
+
+    def post(self, request, *args, **kwargs):
+        """ Mark the PO as 'CANCELLED' """
+
+        order = self.get_object()
+        form = self.get_form()
+
+        confirm = str2bool(request.POST.get('confirm', False))
+
+        valid = False
+
+        if not confirm:
+            form.errors['confirm'] = [_('Confirm order cancellation')]
+        else:
+            valid = True
+
+        data = {
+            'form_valid': valid
+        }
+
+        if valid:
+            order.cancel_order()
+
+        return self.renderJsonResponse(request, form, data)
+
+
 class PurchaseOrderIssue(AjaxUpdateView):
     """ View for changing a purchase order from 'PENDING' to 'ISSUED' """