diff --git a/llvm/lib/Target/Mips/MCTargetDesc/CMakeLists.txt b/llvm/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
index 97a6f886d114ec..d3f16e5042c3ac 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
+++ b/llvm/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
@@ -12,6 +12,8 @@ add_llvm_component_library(LLVMMipsDesc
   MipsNaClELFStreamer.cpp
   MipsOptionRecord.cpp
   MipsTargetStreamer.cpp
+  MipsWinCOFFObjectWriter.cpp
+  MipsWinCOFFStreamer.cpp
 
   LINK_COMPONENTS
   CodeGenTypes
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index f8172e576ce4c1..c40372995a9126 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -597,10 +597,30 @@ bool MipsAsmBackend::isMicroMips(const MCSymbol *Sym) const {
   return false;
 }
 
+namespace {
+
+class WindowsMipsAsmBackend : public MipsAsmBackend {
+public:
+  WindowsMipsAsmBackend(const Target &T, const MCRegisterInfo &MRI,
+                        const MCSubtargetInfo &STI)
+      : MipsAsmBackend(T, MRI, STI.getTargetTriple(), STI.getCPU(), false) {}
+
+  std::unique_ptr<MCObjectTargetWriter>
+  createObjectTargetWriter() const override {
+    return createMipsWinCOFFObjectWriter();
+  }
+};
+
+} // end anonymous namespace
+
 MCAsmBackend *llvm::createMipsAsmBackend(const Target &T,
                                          const MCSubtargetInfo &STI,
                                          const MCRegisterInfo &MRI,
                                          const MCTargetOptions &Options) {
+  const Triple &TheTriple = STI.getTargetTriple();
+  if (TheTriple.isOSWindows() && TheTriple.isOSBinFormatCOFF())
+    return new WindowsMipsAsmBackend(T, MRI, STI);
+
   MipsABIInfo ABI = MipsABIInfo::computeTargetABI(STI.getTargetTriple(),
                                                   STI.getCPU(), Options);
   return new MipsAsmBackend(T, MRI, STI.getTargetTriple(), STI.getCPU(),
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
index 074a58cadb556d..fa09a14b3e2380 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
@@ -51,3 +51,14 @@ MipsELFMCAsmInfo::MipsELFMCAsmInfo(const Triple &TheTriple,
   DwarfRegNumForCFI = true;
   HasMipsExpressions = true;
 }
+
+void MipsCOFFMCAsmInfo::anchor() {}
+
+MipsCOFFMCAsmInfo::MipsCOFFMCAsmInfo() {
+  HasSingleParameterDotFile = true;
+  WinEHEncodingType = WinEH::EncodingType::Itanium;
+
+  ExceptionsType = ExceptionHandling::WinEH;
+
+  AllowAtInName = true;
+}
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.h b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.h
index b52ed12d3a0e77..3a2895a79f9c7f 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.h
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.h
@@ -13,6 +13,7 @@
 #ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSMCASMINFO_H
 #define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSMCASMINFO_H
 
+#include "llvm/MC/MCAsmInfoCOFF.h"
 #include "llvm/MC/MCAsmInfoELF.h"
 
 namespace llvm {
@@ -26,6 +27,13 @@ class MipsELFMCAsmInfo : public MCAsmInfoELF {
                             const MCTargetOptions &Options);
 };
 
+class MipsCOFFMCAsmInfo : public MCAsmInfoGNUCOFF {
+  void anchor() override;
+
+public:
+  explicit MipsCOFFMCAsmInfo();
+};
+
 } // namespace llvm
 
 #endif
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
index eff9ecf0d53d31..2d44a8582b1364 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
@@ -45,6 +45,13 @@ using namespace llvm;
 #define GET_REGINFO_MC_DESC
 #include "MipsGenRegisterInfo.inc"
 
+namespace {
+class MipsWinCOFFTargetStreamer : public MipsTargetStreamer {
+public:
+  MipsWinCOFFTargetStreamer(MCStreamer &S) : MipsTargetStreamer(S) {}
+};
+} // end namespace
+
 /// Select the Mips CPU for the given triple and cpu name.
 StringRef MIPS_MC::selectMipsCPU(const Triple &TT, StringRef CPU) {
   if (CPU.empty() || CPU == "generic") {
@@ -84,7 +91,12 @@ static MCSubtargetInfo *createMipsMCSubtargetInfo(const Triple &TT,
 static MCAsmInfo *createMipsMCAsmInfo(const MCRegisterInfo &MRI,
                                       const Triple &TT,
                                       const MCTargetOptions &Options) {
-  MCAsmInfo *MAI = new MipsELFMCAsmInfo(TT, Options);
+  MCAsmInfo *MAI;
+
+  if (TT.isOSWindows())
+    MAI = new MipsCOFFMCAsmInfo();
+  else
+    MAI = new MipsELFMCAsmInfo(TT, Options);
 
   unsigned SP = MRI.getDwarfRegNum(Mips::SP, true);
   MCCFIInstruction Inst = MCCFIInstruction::createDefCfaRegister(nullptr, SP);
@@ -127,6 +139,8 @@ static MCTargetStreamer *createMipsNullTargetStreamer(MCStreamer &S) {
 
 static MCTargetStreamer *
 createMipsObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
+  if (STI.getTargetTriple().isOSBinFormatCOFF())
+    return new MipsWinCOFFTargetStreamer(S);
   return new MipsTargetELFStreamer(S, STI);
 }
 
@@ -186,6 +200,8 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsTargetMC() {
     TargetRegistry::RegisterNullTargetStreamer(*T,
                                                createMipsNullTargetStreamer);
 
+    TargetRegistry::RegisterCOFFStreamer(*T, createMipsWinCOFFStreamer);
+
     // Register the MC subtarget info.
     TargetRegistry::RegisterMCSubtargetInfo(*T, createMipsMCSubtargetInfo);
 
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
index d51f3b9abcfd1b..c5293b03b0ac5a 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
@@ -23,7 +23,9 @@ class MCCodeEmitter;
 class MCContext;
 class MCInstrInfo;
 class MCObjectTargetWriter;
+class MCObjectWriter;
 class MCRegisterInfo;
+class MCStreamer;
 class MCSubtargetInfo;
 class MCTargetOptions;
 class StringRef;
@@ -39,8 +41,20 @@ MCAsmBackend *createMipsAsmBackend(const Target &T, const MCSubtargetInfo &STI,
                                    const MCRegisterInfo &MRI,
                                    const MCTargetOptions &Options);
 
+/// Construct an MIPS Windows COFF machine code streamer which will generate
+/// PE/COFF format object files.
+///
+/// Takes ownership of \p AB and \p CE.
+MCStreamer *createMipsWinCOFFStreamer(MCContext &C,
+                                      std::unique_ptr<MCAsmBackend> &&AB,
+                                      std::unique_ptr<MCObjectWriter> &&OW,
+                                      std::unique_ptr<MCCodeEmitter> &&CE);
+
+/// Construct a Mips ELF object writer.
 std::unique_ptr<MCObjectTargetWriter>
 createMipsELFObjectWriter(const Triple &TT, bool IsN32);
+/// Construct a Mips Win COFF object writer.
+std::unique_ptr<MCObjectTargetWriter> createMipsWinCOFFObjectWriter();
 
 namespace MIPS_MC {
 StringRef selectMipsCPU(const Triple &TT, StringRef CPU);
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFObjectWriter.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFObjectWriter.cpp
new file mode 100644
index 00000000000000..94187c71ba70d6
--- /dev/null
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFObjectWriter.cpp
@@ -0,0 +1,57 @@
+//===- MipsWinCOFFObjectWriter.cpp------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#include "MCTargetDesc/MipsFixupKinds.h"
+#include "MCTargetDesc/MipsMCTargetDesc.h"
+#include "llvm/BinaryFormat/COFF.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCWinCOFFObjectWriter.h"
+
+using namespace llvm;
+
+namespace {
+
+class MipsWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
+public:
+  MipsWinCOFFObjectWriter();
+
+  unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
+                        const MCFixup &Fixup, bool IsCrossSection,
+                        const MCAsmBackend &MAB) const override;
+};
+
+} // end anonymous namespace
+
+MipsWinCOFFObjectWriter::MipsWinCOFFObjectWriter()
+    : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_R4000) {}
+
+unsigned MipsWinCOFFObjectWriter::getRelocType(MCContext &Ctx,
+                                               const MCValue &Target,
+                                               const MCFixup &Fixup,
+                                               bool IsCrossSection,
+                                               const MCAsmBackend &MAB) const {
+  unsigned FixupKind = Fixup.getKind();
+
+  switch (FixupKind) {
+  case FK_Data_4:
+    return COFF::IMAGE_REL_MIPS_REFWORD;
+  case Mips::fixup_Mips_26:
+    return COFF::IMAGE_REL_MIPS_JMPADDR;
+  case Mips::fixup_Mips_HI16:
+    return COFF::IMAGE_REL_MIPS_REFHI;
+  case Mips::fixup_Mips_LO16:
+    return COFF::IMAGE_REL_MIPS_REFLO;
+  default:
+    Ctx.reportError(Fixup.getLoc(), "unsupported relocation type");
+    return COFF::IMAGE_REL_MIPS_REFWORD;
+  }
+}
+
+std::unique_ptr<MCObjectTargetWriter> llvm::createMipsWinCOFFObjectWriter() {
+  return std::make_unique<MipsWinCOFFObjectWriter>();
+}
diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFStreamer.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFStreamer.cpp
new file mode 100644
index 00000000000000..22bf2e1be203cf
--- /dev/null
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsWinCOFFStreamer.cpp
@@ -0,0 +1,33 @@
+//===- MipsWinCOFFStreamer.cpp-----------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+
+#include "MipsMCTargetDesc.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCWinCOFFStreamer.h"
+
+using namespace llvm;
+
+namespace {
+class MipsWinCOFFStreamer : public MCWinCOFFStreamer {
+public:
+  MipsWinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> AB,
+                      std::unique_ptr<MCCodeEmitter> CE,
+                      std::unique_ptr<MCObjectWriter> OW)
+      : MCWinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)) {}
+};
+} // namespace
+
+MCStreamer *llvm::createMipsWinCOFFStreamer(
+    MCContext &C, std::unique_ptr<MCAsmBackend> &&AB,
+    std::unique_ptr<MCObjectWriter> &&OW, std::unique_ptr<MCCodeEmitter> &&CE) {
+  return new MipsWinCOFFStreamer(C, std::move(AB), std::move(CE),
+                                 std::move(OW));
+}
diff --git a/llvm/lib/Target/Mips/MipsTargetMachine.cpp b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
index c7dbcc80148ae4..a98f636d5d867a 100644
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -71,6 +71,8 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeMipsTarget() {
 }
 
 static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
+  if (TT.isOSBinFormatCOFF())
+    return std::make_unique<TargetLoweringObjectFileCOFF>();
   return std::make_unique<MipsTargetObjectFile>();
 }
 
diff --git a/llvm/test/MC/Mips/coff-basic.ll b/llvm/test/MC/Mips/coff-basic.ll
new file mode 100644
index 00000000000000..4c25cd659c5c79
--- /dev/null
+++ b/llvm/test/MC/Mips/coff-basic.ll
@@ -0,0 +1,7 @@
+; RUN: llc -mtriple mipsel-windows -filetype=obj < %s | obj2yaml | FileCheck %s
+
+define i32 @foo() {
+  ret i32 0
+}
+
+; CHECK: Machine:         IMAGE_FILE_MACHINE_R4000
diff --git a/llvm/test/MC/Mips/coff-relocs.ll b/llvm/test/MC/Mips/coff-relocs.ll
new file mode 100644
index 00000000000000..1d8b3f192d7af6
--- /dev/null
+++ b/llvm/test/MC/Mips/coff-relocs.ll
@@ -0,0 +1,42 @@
+; RUN: llc -mtriple mipsel-windows -filetype=obj < %s | obj2yaml | FileCheck %s
+
+; CHECK:  Machine:         IMAGE_FILE_MACHINE_R4000
+
+
+
+; CHECK:  - Name:            .text
+; CHECK:    Relocations:
+
+declare void @bar()
+define i32 @foo_jmp() {
+  call i32 @bar()
+; CHECK:      - VirtualAddress:  8
+; CHECK:        SymbolName:      bar
+; CHECK:        Type:            IMAGE_REL_MIPS_JMPADDR
+  ret i32 0
+}
+
+@var = external global i32
+define i32 @foo_var() {
+  %1 = load i32, i32* @var
+; CHECK:      - VirtualAddress:  32
+; CHECK:        SymbolName:      var
+; CHECK:        Type:            IMAGE_REL_MIPS_REFHI
+; CHECK:      - VirtualAddress:  40
+; CHECK:        SymbolName:      var
+; CHECK:        Type:            IMAGE_REL_MIPS_REFLO
+  ret i32 %1
+}
+
+
+
+; CHECK:  - Name:            .data
+; CHECK:    Relocations:
+
+%struct._PTR = type { ptr }
+
+@var1 = internal global %struct._PTR { ptr @var2 }
+@var2 = external global i32
+; CHECK:      - VirtualAddress:  0
+; CHECK:        SymbolName:      var2
+; CHECK:        Type:            IMAGE_REL_MIPS_REFWORD