diff --git a/OvmfPkg/Csm/Include/Guid/LegacyBios.h b/OvmfPkg/Csm/Include/Guid/LegacyBios.h
deleted file mode 100644
index b196844d00..0000000000
--- a/OvmfPkg/Csm/Include/Guid/LegacyBios.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/** @file
-  Defines a Tag GUID used to mark a UEFI legacy BIOS thunk driver based
-  on legacy BIOS services and legacy option ROM. This Tag GUID must be installed on
-  the ImageHandle of any module that follows the EFI Driver Model and uses
-  the Int86() or FarCall() services of the Legacy Bios Protocol to produce
-  a standard UEFI I/O Protocol.
-
-Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
-
-SPDX-License-Identifier: BSD-2-Clause-Patent
-
-**/
-
-#ifndef _LEGACY_BIOS_H_
-#define _LEGACY_BIOS_H_
-
-///
-/// The Global ID for the Legacy BIOS GUID that must be installed onto the ImageHandle
-/// of any module follows the EFI Driver Model and uses the Int86() or FarCall()
-/// services of the Legacy BIOS Protocol to produce a standard UEFI I/O Protocol.
-///
-#define EFI_LEGACY_BIOS_GUID \
-  { \
-    0x2e3044ac, 0x879f, 0x490f, {0x97, 0x60, 0xbb, 0xdf, 0xaf, 0x69, 0x5f, 0x50 } \
-  }
-
-extern EFI_GUID  gEfiLegacyBiosGuid;
-
-#endif
diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index de4b6fe5c0..060198e627 100644
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -155,7 +155,6 @@
   gXenBusRootDeviceGuid                 = {0xa732241f, 0x383d, 0x4d9c, {0x8a, 0xe1, 0x8e, 0x09, 0x83, 0x75, 0x89, 0xd7}}
   gRootBridgesConnectedEventGroupGuid   = {0x24a2d66f, 0xeedd, 0x4086, {0x90, 0x42, 0xf2, 0x6e, 0x47, 0x97, 0xee, 0x69}}
   gMicrosoftVendorGuid                  = {0x77fa9abd, 0x0359, 0x4d32, {0xbd, 0x60, 0x28, 0xf4, 0xe7, 0x8f, 0x78, 0x4b}}
-  gEfiLegacyBiosGuid                    = {0x2E3044AC, 0x879F, 0x490F, {0x97, 0x60, 0xBB, 0xDF, 0xAF, 0x69, 0x5F, 0x50}}
   gQemuKernelLoaderFsMediaGuid          = {0x1428f772, 0xb64a, 0x441e, {0xb8, 0xc3, 0x9e, 0xbd, 0xd7, 0xf8, 0x93, 0xc7}}
   gGrubFileGuid                         = {0xb5ae312c, 0xbc8a, 0x43b1, {0x9c, 0x62, 0xeb, 0xb8, 0x26, 0xdd, 0x5d, 0x07}}
   gConfidentialComputingSecretGuid      = {0xadf956ad, 0xe98c, 0x484c, {0xae, 0x11, 0xb5, 0x1c, 0x7d, 0x33, 0x64, 0x47}}