diff --git a/mlir/include/mlir/Dialect/OpenACC/OpenACCOps.td b/mlir/include/mlir/Dialect/OpenACC/OpenACCOps.td
--- a/mlir/include/mlir/Dialect/OpenACC/OpenACCOps.td
+++ b/mlir/include/mlir/Dialect/OpenACC/OpenACCOps.td
@@ -139,6 +139,12 @@
     static StringRef getAttachKeyword() { return "attach"; }
     static StringRef getPrivateKeyword() { return "private"; }
     static StringRef getFirstPrivateKeyword() { return "firstprivate"; }
+
+    /// The number of data operands.
+    unsigned getNumDataOperands();
+
+    /// The i-th data operand passed.
+    Value getDataOperand(unsigned i);
   }];
 
   let verifier = ?;
diff --git a/mlir/lib/Conversion/OpenACCToLLVM/OpenACCToLLVM.cpp b/mlir/lib/Conversion/OpenACCToLLVM/OpenACCToLLVM.cpp
--- a/mlir/lib/Conversion/OpenACCToLLVM/OpenACCToLLVM.cpp
+++ b/mlir/lib/Conversion/OpenACCToLLVM/OpenACCToLLVM.cpp
@@ -140,6 +140,7 @@
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::DataOp>>(converter);
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::EnterDataOp>>(converter);
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::ExitDataOp>>(converter);
+  patterns.add<LegalizeDataOpForLLVMTranslation<acc::ParallelOp>>(converter);
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::UpdateOp>>(converter);
 }
 
@@ -201,6 +202,24 @@
                allDataOperandsAreConverted(op.detachOperands());
       });
 
+  target.addDynamicallyLegalOp<acc::ParallelOp>(
+      [allDataOperandsAreConverted](acc::ParallelOp op) {
+        return allDataOperandsAreConverted(op.reductionOperands()) &&
+               allDataOperandsAreConverted(op.copyOperands()) &&
+               allDataOperandsAreConverted(op.copyinOperands()) &&
+               allDataOperandsAreConverted(op.copyinReadonlyOperands()) &&
+               allDataOperandsAreConverted(op.copyoutOperands()) &&
+               allDataOperandsAreConverted(op.copyoutZeroOperands()) &&
+               allDataOperandsAreConverted(op.createOperands()) &&
+               allDataOperandsAreConverted(op.createZeroOperands()) &&
+               allDataOperandsAreConverted(op.noCreateOperands()) &&
+               allDataOperandsAreConverted(op.presentOperands()) &&
+               allDataOperandsAreConverted(op.devicePtrOperands()) &&
+               allDataOperandsAreConverted(op.attachOperands()) &&
+               allDataOperandsAreConverted(op.gangPrivateOperands()) &&
+               allDataOperandsAreConverted(op.gangFirstPrivateOperands());
+      });
+
   target.addDynamicallyLegalOp<acc::UpdateOp>(
       [allDataOperandsAreConverted](acc::UpdateOp op) {
         return allDataOperandsAreConverted(op.hostOperands()) &&
diff --git a/mlir/lib/Dialect/OpenACC/IR/OpenACC.cpp b/mlir/lib/Dialect/OpenACC/IR/OpenACC.cpp
--- a/mlir/lib/Dialect/OpenACC/IR/OpenACC.cpp
+++ b/mlir/lib/Dialect/OpenACC/IR/OpenACC.cpp
@@ -448,6 +448,26 @@
       op->getAttrs(), ParallelOp::getOperandSegmentSizeAttr());
 }
 
+unsigned ParallelOp::getNumDataOperands() {
+  return reductionOperands().size() + copyOperands().size() +
+         copyinOperands().size() + copyinReadonlyOperands().size() +
+         copyoutOperands().size() + copyoutZeroOperands().size() +
+         createOperands().size() + createZeroOperands().size() +
+         noCreateOperands().size() + presentOperands().size() +
+         devicePtrOperands().size() + attachOperands().size() +
+         gangPrivateOperands().size() + gangFirstPrivateOperands().size();
+}
+
+Value ParallelOp::getDataOperand(unsigned i) {
+  unsigned numOptional = async() ? 1 : 0;
+  numOptional += numGangs() ? 1 : 0;
+  numOptional += numWorkers() ? 1 : 0;
+  numOptional += vectorLength() ? 1 : 0;
+  numOptional += ifCond() ? 1 : 0;
+  numOptional += selfCond() ? 1 : 0;
+  return getOperand(waitOperands().size() + numOptional + i);
+}
+
 //===----------------------------------------------------------------------===//
 // LoopOp
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/Conversion/OpenACCToLLVM/convert-data-operands-to-llvmir.mlir b/mlir/test/Conversion/OpenACCToLLVM/convert-data-operands-to-llvmir.mlir
--- a/mlir/test/Conversion/OpenACCToLLVM/convert-data-operands-to-llvmir.mlir
+++ b/mlir/test/Conversion/OpenACCToLLVM/convert-data-operands-to-llvmir.mlir
@@ -159,3 +159,65 @@
 }
 
 // CHECK: acc.data present(%{{.*}}, %{{.*}} : !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>, !llvm.struct<"openacc_data.1", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>)
+
+// -----
+
+func @testparallelop(%a: memref<10xf32>, %b: memref<10xf32>) -> () {
+  acc.parallel copy(%b : memref<10xf32>) copyout(%a : memref<10xf32>) {
+  }
+  return
+}
+
+// CHECK: acc.parallel copy(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>) copyout(%{{.*}}: !llvm.struct<"openacc_data.1", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>)
+
+// -----
+
+func @testparallelop(%a: !llvm.ptr<f32>, %b: memref<10xf32>, %c: !llvm.ptr<f32>) -> () {
+  acc.parallel copyin(%b : memref<10xf32>) deviceptr(%c: !llvm.ptr<f32>) attach(%a : !llvm.ptr<f32>) {
+  }
+  return
+}
+
+// CHECK: acc.parallel copyin(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>) deviceptr(%{{.*}}: !llvm.ptr<f32>) attach(%{{.*}}: !llvm.ptr<f32>)
+
+// -----
+
+func @testparallelop(%a: memref<10xf32>, %b: memref<10xf32>) -> () {
+  %ifCond = constant true
+  acc.parallel if(%ifCond) copyin_readonly(%b : memref<10xf32>) copyout_zero(%a : memref<10xf32>) {
+  }
+  return
+}
+
+// CHECK: acc.parallel if(%{{.*}}) copyin_readonly(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>) copyout_zero(%{{.*}}: !llvm.struct<"openacc_data.1", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>)
+
+// -----
+
+func @testparallelop(%a: !llvm.ptr<f32>, %b: memref<10xf32>, %c: !llvm.ptr<f32>) -> () {
+  acc.parallel create(%b : memref<10xf32>) create_zero(%c: !llvm.ptr<f32>) no_create(%a : !llvm.ptr<f32>) {
+  }
+  return
+}
+
+// CHECK: acc.parallel create(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>) create_zero(%{{.*}}: !llvm.ptr<f32>) no_create(%{{.*}}: !llvm.ptr<f32>)
+
+// -----
+
+func @testparallelop(%a: memref<10xf32>, %b: memref<10xf32>) -> () {
+  acc.parallel present(%a: memref<10xf32>, %b: memref<10xf32>) {
+  }
+  return
+}
+
+// CHECK: acc.parallel present(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>, %{{.*}}: !llvm.struct<"openacc_data.1", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>)
+
+// -----
+
+func @testparallelop(%i: i64, %a: memref<10xf32>, %b: memref<10xf32>) -> () {
+  acc.parallel num_gangs(%i: i64) present(%a: memref<10xf32>, %b: memref<10xf32>) {
+  } attributes {async}
+  return
+}
+
+// CHECK: acc.parallel num_gangs(%{{.*}}: i64) present(%{{.*}}: !llvm.struct<"openacc_data", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>, %{{.*}}: !llvm.struct<"openacc_data.1", (struct<(ptr<f32>, ptr<f32>, i64, array<1 x i64>, array<1 x i64>)>, ptr<f32>, i64)>)
+// CHECK-NEXT: } attributes {async}