diff --git a/rhodecode/controllers/admin/repos.py b/rhodecode/controllers/admin/repos.py
--- a/rhodecode/controllers/admin/repos.py
+++ b/rhodecode/controllers/admin/repos.py
@@ -286,6 +286,20 @@ class ReposController(BaseRepoController
             h.not_mapped_error(repo_name)
             return redirect(url('repos'))
         try:
+            _forks = repo.forks.count()
+            if _forks and request.POST.get('forks'):
+                do = request.POST['forks']
+                if do == 'detach_forks':
+                    for r in repo.forks:
+                        log.debug('Detaching fork %s from repo %s' % (r, repo))
+                        r.fork = None
+                        Session().add(r)
+                    h.flash(_('detached %s forks') % _forks, category='success')
+                elif do == 'delete_forks':
+                    for r in repo.forks:
+                        log.debug('Deleting fork %s of repo %s' % (r, repo))
+                        repo_model.delete(r)
+                    h.flash(_('deleted %s forks') % _forks, category='success')
             action_logger(self.rhodecode_user, 'admin_deleted_repo',
                               repo_name, self.ip_addr, self.sa)
             repo_model.delete(repo)
diff --git a/rhodecode/templates/admin/repos/repo_edit.html b/rhodecode/templates/admin/repos/repo_edit.html
--- a/rhodecode/templates/admin/repos/repo_edit.html
+++ b/rhodecode/templates/admin/repos/repo_edit.html
@@ -291,6 +291,11 @@
         <div class="form">
            <div class="fields">
                ${h.submit('remove_%s' % c.repo_info.repo_name,_('Remove this repository'),class_="ui-btn red",onclick="return confirm('"+_('Confirm to delete this repository')+"');")}
+              %if c.repo_info.forks.count():
+                    - ${ungettext('this repository has %s fork', 'this repository has %s forks', c.repo_info.forks.count()) % c.repo_info.forks.count()} 
+                    <input type="radio" name="forks" value="detach_forks" checked="checked"/> <label for="forks">${_('Detach forks')}</label>
+                    <input type="radio" name="forks" value="delete_forks" /> <label for="forks">${_('Delete forks')}</label>
+              %endif               
            </div>
            <div class="field" style="border:none;color:#888">
            <ul>