diff --git a/InvenTree/company/models.py b/InvenTree/company/models.py
index fff38a8e99..9b881c227e 100644
--- a/InvenTree/company/models.py
+++ b/InvenTree/company/models.py
@@ -290,9 +290,6 @@ class Contact(models.Model):
 
     role = models.CharField(max_length=100, blank=True)
 
-    company = models.ForeignKey(Company, related_name='contacts',
-                                on_delete=models.CASCADE)
-
 
 class ManufacturerPart(models.Model):
     """ Represents a unique part as provided by a Manufacturer
diff --git a/InvenTree/company/templates/company/company_base.html b/InvenTree/company/templates/company/company_base.html
index 489493fd06..c58ea63791 100644
--- a/InvenTree/company/templates/company/company_base.html
+++ b/InvenTree/company/templates/company/company_base.html
@@ -23,6 +23,8 @@
     <span class='fas fa-shopping-cart'/>
 </button>
 {% endif %}
+{% define perms.company.change_company or perms.company.delete_company as has_permission %}
+{% if has_permission %}
 <button id='company-edit-actions' title='{% trans "Company actions" %}' class='btn btn-outline-secondary dropdown-toggle' type='button' data-bs-toggle='dropdown'>
     <span class='fas fa-tools'></span> <span class='caret'></span>
 </button>
@@ -38,6 +40,7 @@
     </a></li>
     {% endif %}
 </ul>
+{% endif %}
 {% endblock actions %}
 
 {% block thumbnail %}
diff --git a/InvenTree/company/templates/company/manufacturer_part.html b/InvenTree/company/templates/company/manufacturer_part.html
index a3a2bbc65e..5a0e741c1a 100644
--- a/InvenTree/company/templates/company/manufacturer_part.html
+++ b/InvenTree/company/templates/company/manufacturer_part.html
@@ -88,7 +88,14 @@ src="{% static 'img/blank_image.png' %}"
     <tr>
         <td><span class='fas fa-industry'></span></td>
         <td>{% trans "Manufacturer" %}</td>
-        <td><a href="{% url 'company-detail' part.manufacturer.id %}">{{ part.manufacturer.name }}</a>{% include "clip.html"%}</td>
+        <td>
+            {% if part.manufacturer %}
+            <a href="{% url 'company-detail' part.manufacturer.id %}">{{ part.manufacturer.name }}</a>{% include "clip.html"%}
+            {% else %}
+            <em>{% trans "No manufacturer information available" %}</em>
+            {% endif %}
+            {% endif %}
+        </td>
     </tr>
     <tr>
         <td><span class='fas fa-hashtag'></span></td>
@@ -329,7 +336,11 @@ $('#delete-part').click(function() {
 
     deleteManufacturerPart({{ part.pk }}, {
         onSuccess: function() {
+            {% if part.manufacturer %}
             window.location.href = "{% url 'company-detail' part.manufacturer.id %}";
+            {% else%}
+            window.location.href = "{% url 'index' %}";
+            {% endif %}
         }
     });
 });
diff --git a/InvenTree/company/templates/company/supplier_part.html b/InvenTree/company/templates/company/supplier_part.html
index 250c595476..f990b66898 100644
--- a/InvenTree/company/templates/company/supplier_part.html
+++ b/InvenTree/company/templates/company/supplier_part.html
@@ -85,7 +85,13 @@ src="{% static 'img/blank_image.png' %}"
         <tr>
             <td><span class='fas fa-building'></span></td>
             <td>{% trans "Supplier" %}</td>
-            <td><a href="{% url 'company-detail' part.supplier.id %}">{{ part.supplier.name }}</a>{% include "clip.html"%}</td></tr>
+            <td>{% if part.supplier %}
+                <a href="{% url 'company-detail' part.supplier.id %}">{{ part.supplier.name }}</a>{% include "clip.html"%}
+                {% else %}
+                <em>{% trans "No supplier information available" %}</em>
+                {% endif %}
+            </td>
+        </tr>
         <tr>
             <td><span class='fas fa-hashtag'></span></td>
             <td>{% trans "SKU" %}</td>
@@ -356,7 +362,9 @@ $('#delete-part').click(function() {
 
     deleteSupplierPart({{ part.pk }}, {
         onSuccess: function() {
+            {% if part.supplier %}
             window.location.href = "{% url 'company-detail' part.supplier.id %}";
+            {% endif %}
         }
     });
 });
diff --git a/InvenTree/order/migrations/0066_alter_purchaseorder_supplier.py b/InvenTree/order/migrations/0066_alter_purchaseorder_supplier.py
new file mode 100644
index 0000000000..d37aedaeda
--- /dev/null
+++ b/InvenTree/order/migrations/0066_alter_purchaseorder_supplier.py
@@ -0,0 +1,20 @@
+# Generated by Django 3.2.13 on 2022-04-30 22:11
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('company', '0042_supplierpricebreak_updated'),
+        ('order', '0065_alter_purchaseorderlineitem_part'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='purchaseorder',
+            name='supplier',
+            field=models.ForeignKey(help_text='Company from which the items are being ordered', limit_choices_to={'is_supplier': True}, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='purchase_orders', to='company.company', verbose_name='Supplier'),
+        ),
+    ]
diff --git a/InvenTree/order/models.py b/InvenTree/order/models.py
index 2b722ddecd..060d638de1 100644
--- a/InvenTree/order/models.py
+++ b/InvenTree/order/models.py
@@ -228,7 +228,7 @@ class PurchaseOrder(Order):
 
         prefix = getSetting('PURCHASEORDER_REFERENCE_PREFIX')
 
-        return f"{prefix}{self.reference} - {self.supplier.name}"
+        return f"{prefix}{self.reference} - {self.supplier.name if self.supplier else _('deleted')}"
 
     reference = models.CharField(
         unique=True,
@@ -243,7 +243,8 @@ class PurchaseOrder(Order):
                                          help_text=_('Purchase order status'))
 
     supplier = models.ForeignKey(
-        Company, on_delete=models.CASCADE,
+        Company, on_delete=models.SET_NULL,
+        null=True,
         limit_choices_to={
             'is_supplier': True,
         },
@@ -575,7 +576,7 @@ class SalesOrder(Order):
 
         prefix = getSetting('SALESORDER_REFERENCE_PREFIX')
 
-        return f"{prefix}{self.reference} - {self.customer.name}"
+        return f"{prefix}{self.reference} - {self.customer.name if self.customer else _('deleted')}"
 
     def get_absolute_url(self):
         return reverse('so-detail', kwargs={'pk': self.id})
@@ -938,7 +939,7 @@ class PurchaseOrderLineItem(OrderLineItem):
         return "{n} x {part} from {supplier} (for {po})".format(
             n=decimal2string(self.quantity),
             part=self.part.SKU if self.part else 'unknown part',
-            supplier=self.order.supplier.name,
+            supplier=self.order.supplier.name if self.order.supplier else _('deleted'),
             po=self.order)
 
     order = models.ForeignKey(
diff --git a/InvenTree/order/templates/order/order_base.html b/InvenTree/order/templates/order/order_base.html
index c2aa10f722..b80275b1f3 100644
--- a/InvenTree/order/templates/order/order_base.html
+++ b/InvenTree/order/templates/order/order_base.html
@@ -67,7 +67,7 @@
 
 {% block thumbnail %}
 <img class='part-thumb'
-{% if order.supplier.image %}
+{% if order.supplier and order.supplier.image %}
 src="{{ order.supplier.image.url }}"
 {% else %}
 src="{% static 'img/blank_image.png' %}"
@@ -110,7 +110,13 @@ src="{% static 'img/blank_image.png' %}"
     <tr>
         <td><span class='fas fa-building'></span></td>
         <td>{% trans "Supplier" %}</td>
-        <td><a href="{% url 'company-detail' order.supplier.id %}">{{ order.supplier.name }}</a>{% include "clip.html"%}</td>
+        <td>
+            {% if order.supplier %}
+            <a href="{% url 'company-detail' order.supplier.id %}">{{ order.supplier.name }}</a>{% include "clip.html"%}
+            {% else %}
+            <em>{% trans "No suppplier information available" %}</em>
+            {% endif %}
+        </td>
     </tr>
     {% if order.supplier_reference %}
     <tr>
diff --git a/InvenTree/order/templates/order/purchase_order_detail.html b/InvenTree/order/templates/order/purchase_order_detail.html
index 23bdd908e1..542a7a90ca 100644
--- a/InvenTree/order/templates/order/purchase_order_detail.html
+++ b/InvenTree/order/templates/order/purchase_order_detail.html
@@ -170,10 +170,12 @@ $('#new-po-line').click(function() {
 
     var fields = poLineItemFields({
         order: {{ order.pk }},
+        {% if order.supplier %}
         supplier: {{ order.supplier.pk }},
         {% if order.supplier.currency %}
         currency: '{{ order.supplier.currency }}',
         {% endif %}
+        {% endif %}
     });
 
     constructForm('{% url "api-po-line-list" %}', {
@@ -210,7 +212,9 @@ $('#new-po-line').click(function() {
 
 loadPurchaseOrderLineItemTable('#po-line-table', {
     order: {{ order.pk }},
+    {% if order.supplier %}
     supplier: {{ order.supplier.pk }},
+    {% endif %}
     {% if roles.purchase_order.change %}
     allow_edit: true,
     {% else %}
diff --git a/InvenTree/part/templates/part/partial_delete.html b/InvenTree/part/templates/part/partial_delete.html
index eb23fbee09..22c739b833 100644
--- a/InvenTree/part/templates/part/partial_delete.html
+++ b/InvenTree/part/templates/part/partial_delete.html
@@ -43,7 +43,7 @@
 <p>{% blocktrans with count=part.manufacturer_parts.all|length %}There are {{count}} manufacturers defined for this part. If you delete this part, the following manufacturer parts will also be deleted:{% endblocktrans %}
     <ul class='list-group'>
         {% for spart in part.manufacturer_parts.all %}
-        <li class='list-group-item'>{{ spart.manufacturer.name }} - {{ spart.MPN }}</li>
+        <li class='list-group-item'>{% if spart.manufacturer %}{{ spart.manufacturer.name }} - {% endif %}{{ spart.MPN }}</li>
         {% endfor %}
     </ul>
 </p>
@@ -54,7 +54,9 @@
 <p>{% blocktrans with count=part.supplier_parts.all|length %}There are {{count}} suppliers defined for this part. If you delete this part, the following supplier parts will also be deleted:{% endblocktrans %}
     <ul class='list-group'>
         {% for spart in part.supplier_parts.all %}
+        {% if spart.supplier %}
         <li class='list-group-item'>{{ spart.supplier.name }} - {{ spart.SKU }}</li>
+        {% endif %}
         {% endfor %}
     </ul>
 </p>
diff --git a/InvenTree/report/templates/report/inventree_po_report.html b/InvenTree/report/templates/report/inventree_po_report.html
index d1cae75c3b..9e546fb70e 100644
--- a/InvenTree/report/templates/report/inventree_po_report.html
+++ b/InvenTree/report/templates/report/inventree_po_report.html
@@ -74,7 +74,7 @@ table td.expand {
 
     <div class='header-right'>
         <h3>{% trans "Purchase Order" %} {{ prefix }}{{ reference }}</h3>
-        {{ supplier.name }}
+        {% if supplier %}{{ supplier.name }}{% endif %}{% else %}{% trans "Supplier was deleted" %}{% endif %}
     </div>
 
 {% endblock %}
diff --git a/InvenTree/stock/templates/stock/item_base.html b/InvenTree/stock/templates/stock/item_base.html
index dd77d26d1c..4c8af402cf 100644
--- a/InvenTree/stock/templates/stock/item_base.html
+++ b/InvenTree/stock/templates/stock/item_base.html
@@ -379,7 +379,11 @@
     <tr>
         <td><span class='fas fa-building'></span></td>
         <td>{% trans "Supplier" %}</td>
-        <td><a href="{% url 'company-detail' item.supplier_part.supplier.id %}">{{ item.supplier_part.supplier.name }}</a></td>
+        <td>
+            {% if item.supplier_part.supplier %}
+            <a href="{% url 'company-detail' item.supplier_part.supplier.id %}">{{ item.supplier_part.supplier.name }}</a>
+            {% endif %}
+        </td>
     </tr>
     <tr>
         <td><span class='fas fa-shapes'></span></td>