diff --git a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
index 73f08fb3a..8555aa805 100644
--- a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+++ b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
@@ -6019,6 +6019,7 @@ void OpDispatchBuilder::InstallHostSpecificOpcodeHandlers() {
     {OPD(2, 0b01, 0xDC), 1, &OpDispatchBuilder::VAESEncOp},
     {OPD(2, 0b01, 0xDD), 1, &OpDispatchBuilder::VAESEncLastOp},
     {OPD(2, 0b01, 0xDE), 1, &OpDispatchBuilder::VAESDecOp},
+    {OPD(2, 0b01, 0xDF), 1, &OpDispatchBuilder::VAESDecLastOp},
 
     {OPD(3, 0b01, 0x00), 1, &OpDispatchBuilder::VPERMQOp},
     {OPD(3, 0b01, 0x01), 1, &OpDispatchBuilder::VPERMQOp},
diff --git a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.h b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
index 4e100e899..47e3279db 100644
--- a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
+++ b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher.h
@@ -420,6 +420,7 @@ public:
   void VADDSUBPOp(OpcodeArgs);
 
   void VAESDecOp(OpcodeArgs);
+  void VAESDecLastOp(OpcodeArgs);
   void VAESEncOp(OpcodeArgs);
   void VAESEncLastOp(OpcodeArgs);
   void VAESIMCOp(OpcodeArgs);
diff --git a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher/Crypto.cpp b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher/Crypto.cpp
index da0a151c4..0331b7774 100644
--- a/External/FEXCore/Source/Interface/Core/OpcodeDispatcher/Crypto.cpp
+++ b/External/FEXCore/Source/Interface/Core/OpcodeDispatcher/Crypto.cpp
@@ -355,8 +355,25 @@ void OpDispatchBuilder::VAESDecOp(OpcodeArgs) {
 void OpDispatchBuilder::AESDecLastOp(OpcodeArgs) {
   OrderedNode *Dest = LoadSource(FPRClass, Op, Op->Dest, Op->Flags, -1);
   OrderedNode *Src = LoadSource(FPRClass, Op, Op->Src[0], Op->Flags, -1);
-  auto Res = _VAESDecLast(Dest, Src);
-  StoreResult(FPRClass, Op, Res, -1);
+  OrderedNode *Result = _VAESDecLast(Dest, Src);
+  StoreResult(FPRClass, Op, Result, -1);
+}
+
+void OpDispatchBuilder::VAESDecLastOp(OpcodeArgs) {
+  const auto DstSize = GetDstSize(Op);
+  const auto Is128Bit = DstSize == Core::CPUState::XMM_SSE_REG_SIZE;
+
+  // TODO: Handle 256-bit VAESDECLAST.
+  LOGMAN_THROW_A_FMT(Is128Bit, "256-bit VAESDECLAST unimplemented");
+
+  OrderedNode *State = LoadSource(FPRClass, Op, Op->Src[0], Op->Flags, -1);
+  OrderedNode *Key = LoadSource(FPRClass, Op, Op->Src[1], Op->Flags, -1);
+  OrderedNode *Result = _VAESDecLast(State, Key);
+
+  if (Is128Bit) {
+    Result = _VMov(16, Result);
+  }
+  StoreResult(FPRClass, Op, Result, -1);
 }
 
 OrderedNode* OpDispatchBuilder::AESKeyGenAssistImpl(OpcodeArgs) {
diff --git a/External/FEXCore/Source/Interface/Core/X86Tables/VEXTables.cpp b/External/FEXCore/Source/Interface/Core/X86Tables/VEXTables.cpp
index 4cb7b8e7e..842f8af80 100644
--- a/External/FEXCore/Source/Interface/Core/X86Tables/VEXTables.cpp
+++ b/External/FEXCore/Source/Interface/Core/X86Tables/VEXTables.cpp
@@ -384,7 +384,7 @@ void InitializeVEXTables() {
     {OPD(2, 0b01, 0xDC), 1, X86InstInfo{"VAESENC", TYPE_INST, GenFlagsSameSize(SIZE_128BIT) | FLAGS_MODRM | FLAGS_VEX_1ST_SRC | FLAGS_XMM_FLAGS, 0, nullptr}},
     {OPD(2, 0b01, 0xDD), 1, X86InstInfo{"VAESENCLAST", TYPE_INST, GenFlagsSameSize(SIZE_128BIT) | FLAGS_MODRM | FLAGS_VEX_1ST_SRC | FLAGS_XMM_FLAGS, 0, nullptr}},
     {OPD(2, 0b01, 0xDE), 1, X86InstInfo{"VAESDEC", TYPE_INST, GenFlagsSameSize(SIZE_128BIT) | FLAGS_MODRM | FLAGS_VEX_1ST_SRC | FLAGS_XMM_FLAGS, 0, nullptr}},
-    {OPD(2, 0b01, 0xDF), 1, X86InstInfo{"VAESDECLAST", TYPE_UNDEC, FLAGS_NONE, 0, nullptr}},
+    {OPD(2, 0b01, 0xDF), 1, X86InstInfo{"VAESDECLAST", TYPE_INST, GenFlagsSameSize(SIZE_128BIT) | FLAGS_MODRM | FLAGS_VEX_1ST_SRC | FLAGS_XMM_FLAGS, 0, nullptr}},
 
     {OPD(2, 0b00, 0xF2), 1, X86InstInfo{"ANDN", TYPE_INST, FLAGS_MODRM | FLAGS_VEX_1ST_SRC, 0, nullptr}},
 
diff --git a/unittests/ASM/Disabled_Tests_Simulator b/unittests/ASM/Disabled_Tests_Simulator
index 4b88445f1..72979a949 100644
--- a/unittests/ASM/Disabled_Tests_Simulator
+++ b/unittests/ASM/Disabled_Tests_Simulator
@@ -6,6 +6,7 @@ Test_H0F38/66_DE.asm
 Test_H0F38/66_DF.asm
 Test_H0F3A/0_66_DF.asm
 Test_VEX/vaesdec.asm
+Test_VEX/vaesdeclast.asm
 Test_VEX/vaesenc.asm
 Test_VEX/vaesenclast.asm
 Test_VEX/vaesimc.asm
diff --git a/unittests/ASM/VEX/vaesdeclast.asm b/unittests/ASM/VEX/vaesdeclast.asm
new file mode 100644
index 000000000..589abd1bc
--- /dev/null
+++ b/unittests/ASM/VEX/vaesdeclast.asm
@@ -0,0 +1,49 @@
+%ifdef CONFIG
+{
+  "HostFeatures": ["AVX"],
+  "RegData": {
+    "XMM1": ["0xD5D56A6A6AD5D56A", "0x6A6AD5D5D56A6AD5", "0x0000000000000000", "0x0000000000000000"],
+    "XMM2": ["0x2A2A9595952A2A95", "0x95952A2A2A95952A", "0x0000000000000000", "0x0000000000000000"],
+    "XMM3": ["0xD5D56A6B6AD5D56B", "0x6A6AD5D4D56A6AD4", "0x0000000000000000", "0x0000000000000000"],
+    "XMM4": ["0x2A2A95956AD5D56A", "0x6A6AD5D42A95952A", "0x0000000000000000", "0x0000000000000000"]
+  }
+}
+%endif
+
+lea rdx, [rel .data]
+
+vmovaps ymm0, [rdx + 32 * 4]
+
+vaesdeclast xmm1, xmm0, [rdx + 32 * 0]
+vaesdeclast xmm2, xmm0, [rdx + 32 * 1]
+vaesdeclast xmm3, xmm0, [rdx + 32 * 2]
+vaesdeclast xmm4, xmm0, [rdx + 32 * 3]
+
+hlt
+
+align 32
+.data:
+dq 0x0000000000000000
+dq 0x0000000000000000
+dq 0x0000000000000000
+dq 0x0000000000000000
+
+dq 0xFFFFFFFFFFFFFFFF
+dq 0xFFFFFFFFFFFFFFFF
+dq 0xFFFFFFFFFFFFFFFF
+dq 0xFFFFFFFFFFFFFFFF
+
+dq 0x0000000100000001
+dq 0x0000000100000001
+dq 0x0000000100000001
+dq 0x0000000100000001
+
+dq 0xFFFFFFFF00000000
+dq 0x00000001FFFFFFFF
+dq 0xFFFFFFFF00000000
+dq 0x00000001FFFFFFFF
+
+dq 0x0202020202020202
+dq 0x0303030303030303
+dq 0x0202020202020202
+dq 0x0303030303030303