diff --git a/MdePkg/Include/IndustryStandard/DebugPort2Table.h b/MdePkg/Include/IndustryStandard/DebugPort2Table.h
index 9ccfc1b1ee..8aab77b95c 100644
--- a/MdePkg/Include/IndustryStandard/DebugPort2Table.h
+++ b/MdePkg/Include/IndustryStandard/DebugPort2Table.h
@@ -43,6 +43,7 @@ typedef struct {
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_FULL_16550                                 0x0000
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_16550_SUBSET_COMPATIBLE_WITH_MS_DBGP_SPEC  0x0001
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_ARM_PL011_UART                             0x0003
+#define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_NVIDIA_16550_UART                          0x0005
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_ARM_SBSA_GENERIC_UART_2X                   0x000d
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_ARM_SBSA_GENERIC_UART                      0x000e
 #define   EFI_ACPI_DBG2_PORT_SUBTYPE_SERIAL_DCC                                        0x000f
diff --git a/MdePkg/Include/IndustryStandard/SerialPortConsoleRedirectionTable.h b/MdePkg/Include/IndustryStandard/SerialPortConsoleRedirectionTable.h
index 7796796afe..8fd1582be4 100644
--- a/MdePkg/Include/IndustryStandard/SerialPortConsoleRedirectionTable.h
+++ b/MdePkg/Include/IndustryStandard/SerialPortConsoleRedirectionTable.h
@@ -80,6 +80,11 @@ typedef struct {
 ///
 #define EFI_ACPI_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_INTERFACE_TYPE_ARM_PL011_UART            0x03
 
+///
+/// NVIDIA 16550 UART
+///
+#define EFI_ACPI_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_INTERFACE_TYPE_NVIDIA_16550_UART         0x05
+
 ///
 /// ARM SBSA Generic UART (2.x) supporting 32-bit only accesses [deprecated]
 ///