diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
@@ -780,6 +780,17 @@
   let cppNamespace = "::mlir::LLVM";
 }
 
+def UnnamedAddrNone : LLVM_EnumAttrCase<"None", "", "None", 0>;
+def UnnamedAddrLocal : LLVM_EnumAttrCase<"Local", "local_unnamed_addr", "Local", 1>;
+def UnnamedAddrGlobal : LLVM_EnumAttrCase<"Global", "unnamed_addr", "Global", 2>;
+
+def UnnamedAddr : LLVM_EnumAttr<
+    "UnnamedAddr",
+    "::llvm::GlobalValue::UnnamedAddr",
+    "LLVM GlobalValue UnnamedAddr",
+    [UnnamedAddrNone, UnnamedAddrLocal, UnnamedAddrGlobal]> {
+  let cppNamespace = "::mlir::LLVM";
+}
 
 def LLVM_AddressOfOp : LLVM_Op<"mlir.addressof"> {
   let arguments = (ins FlatSymbolRefAttr:$global_name);
@@ -896,7 +907,8 @@
     StrAttr:$sym_name,
     Linkage:$linkage,
     OptionalAttr<AnyAttr>:$value,
-    DefaultValuedAttr<Confined<I32Attr, [IntNonNegative]>, "0">:$addr_space
+    DefaultValuedAttr<Confined<I32Attr, [IntNonNegative]>, "0">:$addr_space,
+    OptionalAttr<UnnamedAddr>:$unnamed_addr
   );
   let summary = "LLVM dialect global.";
   let description = [{
diff --git a/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp b/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
--- a/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
@@ -1244,6 +1244,10 @@
 /// the name of the attribute in ODS.
 static StringRef getLinkageAttrName() { return "linkage"; }
 
+/// Returns the name used for the unnamed_addr attribute. This *must* correspond
+/// to the name of the attribute in ODS.
+static StringRef getUnnamedAddrAttrName() { return "unnamed_addr"; }
+
 void GlobalOp::build(OpBuilder &builder, OperationState &result, Type type,
                      bool isConstant, Linkage linkage, StringRef name,
                      Attribute value, unsigned addrSpace,
@@ -1265,6 +1269,8 @@
 
 static void printGlobalOp(OpAsmPrinter &p, GlobalOp op) {
   p << op.getOperationName() << ' ' << stringifyLinkage(op.linkage()) << ' ';
+  if (op.unnamed_addr())
+    p << stringifyUnnamedAddr(*op.unnamed_addr()) << ' ';
   if (op.constant())
     p << "constant ";
   p.printSymbolName(op.sym_name());
@@ -1274,7 +1280,8 @@
   p << ')';
   p.printOptionalAttrDict(op->getAttrs(),
                           {SymbolTable::getSymbolAttrName(), "type", "constant",
-                           "value", getLinkageAttrName()});
+                           "value", getLinkageAttrName(),
+                           getUnnamedAddrAttrName()});
 
   // Print the trailing type unless it's a string global.
   if (op.getValueOrNull().dyn_cast_or_null<StringAttr>())
@@ -1495,6 +1502,7 @@
   }
 
 REGISTER_ENUM_TYPE(Linkage);
+REGISTER_ENUM_TYPE(UnnamedAddr);
 } // end namespace
 
 template <typename EnumTy>
@@ -1524,6 +1532,12 @@
                         parser.getBuilder().getI64IntegerAttr(
                             static_cast<int64_t>(LLVM::Linkage::External)));
 
+  if (failed(parseOptionalLLVMKeyword<UnnamedAddr>(parser, result,
+                                                   getUnnamedAddrAttrName())))
+    result.addAttribute(getUnnamedAddrAttrName(),
+                        parser.getBuilder().getI64IntegerAttr(
+                            static_cast<int64_t>(LLVM::UnnamedAddr::None)));
+
   if (succeeded(parser.parseOptionalKeyword("constant")))
     result.addAttribute("constant", parser.getBuilder().getUnitAttr());
 
diff --git a/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp b/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
--- a/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
+++ b/mlir/lib/Target/LLVMIR/ConvertFromLLVMIR.cpp
@@ -487,6 +487,9 @@
       return nullptr;
     b.create<ReturnOp>(op.getLoc(), ArrayRef<Value>({v}));
   }
+  if (GV->hasAtLeastLocalUnnamedAddr())
+    op.unnamed_addrAttr(UnnamedAddrAttr::get(
+        context, convertUnnamedAddrFromLLVM(GV->getUnnamedAddr())));
   return globals[GV] = op;
 }
 
diff --git a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
--- a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
@@ -407,6 +407,9 @@
         op.sym_name(),
         /*InsertBefore=*/nullptr, llvm::GlobalValue::NotThreadLocal, addrSpace);
 
+    if (op.unnamed_addr().hasValue())
+      var->setUnnamedAddr(convertUnnamedAddrToLLVM(*op.unnamed_addr()));
+
     globalsMapping.try_emplace(op, var);
   }
 
diff --git a/mlir/test/Dialect/LLVMIR/global.mlir b/mlir/test/Dialect/LLVMIR/global.mlir
--- a/mlir/test/Dialect/LLVMIR/global.mlir
+++ b/mlir/test/Dialect/LLVMIR/global.mlir
@@ -63,6 +63,12 @@
   llvm.return
 }
 
+// CHECK: llvm.mlir.global private local_unnamed_addr constant @local(42 : i64) : i64
+llvm.mlir.global private local_unnamed_addr constant @local(42 : i64) : i64
+
+// CHECK: llvm.mlir.global private unnamed_addr constant @foo(42 : i64) : i64
+llvm.mlir.global private unnamed_addr constant @foo(42 : i64) : i64
+
 // -----
 
 // expected-error @+1 {{requires string attribute 'sym_name'}}
diff --git a/mlir/test/Target/LLVMIR/import.ll b/mlir/test/Target/LLVMIR/import.ll
--- a/mlir/test/Target/LLVMIR/import.ll
+++ b/mlir/test/Target/LLVMIR/import.ll
@@ -49,6 +49,18 @@
 ; CHECK: llvm.mlir.global external @external() : i32
 @external = external global i32
 
+;
+; UnnamedAddr attribute.
+;
+
+
+; CHECK: llvm.mlir.global private constant @no_unnamed_addr(42 : i64) : i64
+@no_unnamed_addr = private constant i64 42
+; CHECK: llvm.mlir.global private local_unnamed_addr constant @local_unnamed_addr(42 : i64) : i64
+@local_unnamed_addr = private local_unnamed_addr constant i64 42
+; CHECK: llvm.mlir.global private unnamed_addr constant @unnamed_addr(42 : i64) : i64
+@unnamed_addr = private unnamed_addr constant i64 42
+
 ;
 ; Sequential constants.
 ;
@@ -109,7 +121,7 @@
 if.then:
 ; CHECK: llvm.return %[[c42]] : i32
   ret i32 42
-  
+
 ; CHECK: ^bb2:
 if.end:
 ; CHECK: %[[orcond:[0-9]+]] = llvm.or %[[e]], %[[c1]] : i1
diff --git a/mlir/test/Target/LLVMIR/llvmir.mlir b/mlir/test/Target/LLVMIR/llvmir.mlir
--- a/mlir/test/Target/LLVMIR/llvmir.mlir
+++ b/mlir/test/Target/LLVMIR/llvmir.mlir
@@ -59,6 +59,16 @@
 // CHECK: @external = external global i32
 llvm.mlir.global external @external() : i32
 
+//
+// UnnamedAddr attribute.
+//
+
+// CHECK: @no_unnamed_addr = private constant i64 42
+llvm.mlir.global private constant @no_unnamed_addr(42 : i64) : i64
+// CHECK: @local_unnamed_addr = private local_unnamed_addr constant i64 42
+llvm.mlir.global private local_unnamed_addr constant @local_unnamed_addr(42 : i64) : i64
+// CHECK: @unnamed_addr = private unnamed_addr constant i64 42
+llvm.mlir.global private unnamed_addr constant @unnamed_addr(42 : i64) : i64
 
 //
 // Declarations of the allocation functions to be linked against. These are