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diff --git a/MdePkg/Include/Guid/EventLegacyBios.h b/MdePkg/Include/Guid/EventLegacyBios.h
new file mode 100644
index 0000000000..d38b427d46
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+++ b/MdePkg/Include/Guid/EventLegacyBios.h
@@ -0,0 +1,30 @@
+/** @file
+  GUID is the name of events used with CreateEventEx in order to be notified 
+  when the EFI boot manager is about to boot a legacy boot option.
+  Events of this type are notificated just before Int19h is invoked. 
+
+  Copyright (c) 2006, Intel Corporation                                                         
+  All rights reserved. This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+  Module Name:  EventLegacyBios.h
+
+  @par Revision Reference:
+  GUIDs defined in DXE CIS 0.91b.
+
+**/
+
+#ifndef __EVENT_LEGACY_BIOS_GUID_H__
+#define __EVENT_LEGACY_BIOS_GUID_H__
+
+#define EFI_EVENT_LEGACY_BOOT_GUID \
+   { 0x2a571201, 0x4966, 0x47f6, {0x8b, 0x86, 0xf3, 0x1e, 0x41, 0xf3, 0x2f, 0x10 } }
+
+extern EFI_GUID gEfiEventLegacyBootGuid;
+
+#endif