Index: flang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- flang/lib/Frontend/CompilerInvocation.cpp
+++ flang/lib/Frontend/CompilerInvocation.cpp
@@ -976,13 +976,49 @@
   fortranOptions.isFixedForm = false;
 }
 
+static void setOpenMPMacro(int version,
+                           Fortran::parser::Options &fortranOptions) {
+  switch (version) {
+  case 20:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "200011");
+    break;
+  case 25:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "200505");
+    break;
+  case 30:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "200805");
+    break;
+  case 31:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "201107");
+    break;
+  case 40:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "201307");
+    break;
+  case 45:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
+    break;
+  case 50:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "201811");
+    break;
+  case 51:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "202011");
+    break;
+  case 52:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "202111");
+    break;
+  case 11:
+  default:
+    fortranOptions.predefinitions.emplace_back("_OPENMP", "199911");
+    break;
+  }
+}
+
 // TODO: When expanding this method, consider creating a dedicated API for
 // this. Also at some point we will need to differentiate between different
 // targets and add dedicated predefines for each.
 void CompilerInvocation::setDefaultPredefinitions() {
   auto &fortranOptions = getFortranOpts();
   const auto &frontendOptions = getFrontendOpts();
-
   // Populate the macro list with version numbers and other predefinitions.
   fortranOptions.predefinitions.emplace_back("__flang__", "1");
   fortranOptions.predefinitions.emplace_back("__flang_major__",
@@ -999,7 +1035,7 @@
   }
   if (frontendOptions.features.IsEnabled(
           Fortran::common::LanguageFeature::OpenMP)) {
-    fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
+    setOpenMPMacro(getLangOpts().OpenMPVersion, fortranOptions);
   }
   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
   if (targetTriple.getArch() == llvm::Triple::ArchType::x86_64) {
Index: flang/test/Driver/bbc-openmp-version-macro.f90
===================================================================
--- /dev/null
+++ flang/test/Driver/bbc-openmp-version-macro.f90
@@ -0,0 +1,32 @@
+! Test predefined _OPENMP macro which denotes OpenMP version
+
+! RUN: bbc -fopenmp -o -  %s | FileCheck %s --check-prefix=DEFAULT-OPENMP-VERSION
+! RUN: bbc -fopenmp -fopenmp-version=11 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-11
+! RUN: bbc -fopenmp -fopenmp-version=11 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-11
+! RUN: bbc -fopenmp -fopenmp-version=20 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-20
+! RUN: bbc -fopenmp -fopenmp-version=25 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-25
+! RUN: bbc -fopenmp -fopenmp-version=30 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-30
+! RUN: bbc -fopenmp -fopenmp-version=31 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-31
+! RUN: bbc -fopenmp -fopenmp-version=40 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-40
+! RUN: bbc -fopenmp -fopenmp-version=45 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-45
+! RUN: bbc -fopenmp -fopenmp-version=50 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-50
+! RUN: bbc -fopenmp -fopenmp-version=51 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-51
+! RUN: bbc -fopenmp -fopenmp-version=52 -o - %s | FileCheck %s --check-prefix=OPENMP-VERSION-52
+
+! DEFAULT-OPENMP-VERSION: {{.*}} = arith.constant 199911 : i32
+! OPENMP-VERSION-11: {{.*}} = arith.constant 199911 : i32
+! OPENMP-VERSION-20: {{.*}} = arith.constant 200011 : i32
+! OPENMP-VERSION-25: {{.*}} = arith.constant 200505 : i32
+! OPENMP-VERSION-30: {{.*}} = arith.constant 200805 : i32
+! OPENMP-VERSION-31: {{.*}} = arith.constant 201107 : i32
+! OPENMP-VERSION-40: {{.*}} = arith.constant 201307 : i32
+! OPENMP-VERSION-45: {{.*}} = arith.constant 201511 : i32
+! OPENMP-VERSION-50: {{.*}} = arith.constant 201811 : i32
+! OPENMP-VERSION-51: {{.*}} = arith.constant 202011 : i32
+! OPENMP-VERSION-52: {{.*}} = arith.constant 202111 : i32
+
+#if _OPENMP
+  integer :: var1 = _OPENMP
+#endif
+end program
+
Index: flang/test/Driver/flang-openmp-version-macro.f90
===================================================================
--- /dev/null
+++ flang/test/Driver/flang-openmp-version-macro.f90
@@ -0,0 +1,32 @@
+! Test predefined _OPENMP macro which denotes OpenMP version
+
+! RUN: %flang_fc1 -fopenmp -cpp -E %s | FileCheck %s --check-prefix=DEFAULT-OPENMP-VERSION
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=11 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-11
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=11 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-11
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=20 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-20
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=25 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-25
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=30 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-30
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=31 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-31
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=40 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-40
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=45 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-45
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=50 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-50
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=51 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-51
+! RUN: %flang_fc1 -fopenmp -fopenmp-version=52 -cpp -E %s | FileCheck %s --check-prefix=OPENMP-VERSION-52
+
+! DEFAULT-OPENMP-VERSION: integer :: var1 = 199911
+! OPENMP-VERSION-11: integer :: var1 = 199911
+! OPENMP-VERSION-20: integer :: var1 = 200011
+! OPENMP-VERSION-25: integer :: var1 = 200505
+! OPENMP-VERSION-30: integer :: var1 = 200805
+! OPENMP-VERSION-31: integer :: var1 = 201107
+! OPENMP-VERSION-40: integer :: var1 = 201307
+! OPENMP-VERSION-45: integer :: var1 = 201511
+! OPENMP-VERSION-50: integer :: var1 = 201811
+! OPENMP-VERSION-51: integer :: var1 = 202011
+! OPENMP-VERSION-52: integer :: var1 = 202111
+
+#if _OPENMP
+  integer :: var1 = _OPENMP
+#endif
+end program
+
Index: flang/tools/bbc/bbc.cpp
===================================================================
--- flang/tools/bbc/bbc.cpp
+++ flang/tools/bbc/bbc.cpp
@@ -376,7 +376,39 @@
   // enable parsing of OpenMP
   if (enableOpenMP) {
     options.features.Enable(Fortran::common::LanguageFeature::OpenMP);
-    options.predefinitions.emplace_back("_OPENMP", "201511");
+    switch (setOpenMPVersion) {
+    case 20:
+      options.predefinitions.emplace_back("_OPENMP", "200011");
+      break;
+    case 25:
+      options.predefinitions.emplace_back("_OPENMP", "200505");
+      break;
+    case 30:
+      options.predefinitions.emplace_back("_OPENMP", "200805");
+      break;
+    case 31:
+      options.predefinitions.emplace_back("_OPENMP", "201107");
+      break;
+    case 40:
+      options.predefinitions.emplace_back("_OPENMP", "201307");
+      break;
+    case 45:
+      options.predefinitions.emplace_back("_OPENMP", "201511");
+      break;
+    case 50:
+      options.predefinitions.emplace_back("_OPENMP", "201811");
+      break;
+    case 51:
+      options.predefinitions.emplace_back("_OPENMP", "202011");
+      break;
+    case 52:
+      options.predefinitions.emplace_back("_OPENMP", "202111");
+      break;
+    case 11:
+    default:
+      options.predefinitions.emplace_back("_OPENMP", "199911");
+      break;
+    }
   }
 
   // enable parsing of OpenACC