In Django Admin how do I disable the Delete link

Simple :)

class DeleteNotAllowedModelAdmin(admin.ModelAdmin):
    # Other stuff here
    def has_delete_permission(self, request, obj=None):
        return False

If you want to disable an specific one that isn't custom do this. In django 1.6.6 I had to extend get_actions plus define has_delete_permission. The has_delete_permission solution does not get rid of the action from the dropdown for me:

class MyModelAdmin(admin.ModelAdmin):

    ....

    def get_actions(self, request):
        #Disable delete
        actions = super(MyModelAdmin, self).get_actions(request)
        del actions['delete_selected']
        return actions

    def has_delete_permission(self, request, obj=None):
        #Disable delete
        return False

Not including it in actions = ['your_custom_action'], only works for the custom actions (defs) you have defined for that model. The solution AdminSite.disable_action('delete_selected'), disables it for all models, so you would have to explicitly include them later per each modelAdmin