diff --git a/flang/include/flang/Parser/dump-parse-tree.h b/flang/include/flang/Parser/dump-parse-tree.h
--- a/flang/include/flang/Parser/dump-parse-tree.h
+++ b/flang/include/flang/Parser/dump-parse-tree.h
@@ -509,6 +509,7 @@
   NODE(parser, OmpProcBindClause)
   NODE_ENUM(OmpProcBindClause, Type)
   NODE(parser, OmpReductionClause)
+  NODE(parser, OmpTaskReductionClause)
   NODE(parser, OmpReductionCombiner)
   NODE(OmpReductionCombiner, FunctionCombiner)
   NODE(parser, OmpReductionInitializerClause)
diff --git a/flang/include/flang/Parser/parse-tree.h b/flang/include/flang/Parser/parse-tree.h
--- a/flang/include/flang/Parser/parse-tree.h
+++ b/flang/include/flang/Parser/parse-tree.h
@@ -3422,6 +3422,14 @@
   std::tuple<OmpReductionOperator, std::list<Designator>> t;
 };
 
+// [OMP-5.0] 2.19.5.5 task-reduction-clause -> TASK_REDUCTION
+// (reduction-identifier:
+//                                         variable-name-list)
+struct OmpTaskReductionClause {
+  TUPLE_CLASS_BOILERPLATE(OmpTaskReductionClause);
+  std::tuple<OmpReductionOperator, OmpObjectList> t;
+};
+
 // OMP 5.0 2.11.4 allocate-clause -> ALLOCATE ([allocator:] variable-name-list)
 struct OmpAllocateClause {
   TUPLE_CLASS_BOILERPLATE(OmpAllocateClause);
diff --git a/flang/lib/Parser/openmp-parsers.cpp b/flang/lib/Parser/openmp-parsers.cpp
--- a/flang/lib/Parser/openmp-parsers.cpp
+++ b/flang/lib/Parser/openmp-parsers.cpp
@@ -104,6 +104,10 @@
 TYPE_PARSER(construct<OmpReductionClause>(
     Parser<OmpReductionOperator>{} / ":", nonemptyList(designator)))
 
+//[OMP-5.0] 2.19.5.5 TASK_REDUCTION (reduction-identifier: variable-name-list)
+TYPE_PARSER(construct<OmpTaskReductionClause>(
+    Parser<OmpReductionOperator>{} / ":", Parser<OmpObjectList>{}))
+
 // OMP 5.0 2.11.4  ALLOCATE ([allocator:] variable-name-list)
 TYPE_PARSER(construct<OmpAllocateClause>(
     maybe(construct<OmpAllocateClause::Allocator>(scalarIntExpr) / ":"),
@@ -218,6 +222,8 @@
         construct<OmpClause>(parenthesized(Parser<OmpProcBindClause>{})) ||
     "REDUCTION" >>
         construct<OmpClause>(parenthesized(Parser<OmpReductionClause>{})) ||
+    "TASK_REDUCTION" >>
+        construct<OmpClause>(parenthesized(Parser<OmpTaskReductionClause>{})) ||
     "RELAXED" >> construct<OmpClause>(construct<OmpClause::Relaxed>()) ||
     "RELEASE" >> construct<OmpClause>(construct<OmpClause::Release>()) ||
     "SAFELEN" >> construct<OmpClause>(construct<OmpClause::Safelen>(
diff --git a/flang/lib/Parser/unparse.cpp b/flang/lib/Parser/unparse.cpp
--- a/flang/lib/Parser/unparse.cpp
+++ b/flang/lib/Parser/unparse.cpp
@@ -2010,6 +2010,14 @@
     Walk(std::get<std::list<Designator>>(x.t), ",");
     Put(")");
   }
+  void Unparse(const OmpTaskReductionClause &x) {
+    Word("TASK_REDUCTION(");
+    Walk(std::get<OmpReductionOperator>(x.t));
+    Put(":");
+    Walk(std::get<OmpObjectList>(x.t));
+    Put(")");
+  }
+
   void Unparse(const OmpAllocateClause &x) {
     Word("ALLOCATE(");
     Walk(std::get<std::optional<OmpAllocateClause::Allocator>>(x.t), ":");
diff --git a/flang/lib/Semantics/check-omp-structure.h b/flang/lib/Semantics/check-omp-structure.h
--- a/flang/lib/Semantics/check-omp-structure.h
+++ b/flang/lib/Semantics/check-omp-structure.h
@@ -162,6 +162,7 @@
   void Enter(const parser::OmpMapClause &);
   void Enter(const parser::OmpProcBindClause &);
   void Enter(const parser::OmpReductionClause &);
+  void Enter(const parser::OmpTaskReductionClause &);
   void Enter(const parser::OmpScheduleClause &);
 
 private:
diff --git a/flang/lib/Semantics/check-omp-structure.cpp b/flang/lib/Semantics/check-omp-structure.cpp
--- a/flang/lib/Semantics/check-omp-structure.cpp
+++ b/flang/lib/Semantics/check-omp-structure.cpp
@@ -414,6 +414,7 @@
 CHECK_SIMPLE_PARSER_CLAUSE(OmpNowait, OMPC_nowait)
 CHECK_SIMPLE_PARSER_CLAUSE(OmpProcBindClause, OMPC_proc_bind)
 CHECK_SIMPLE_PARSER_CLAUSE(OmpReductionClause, OMPC_reduction)
+CHECK_SIMPLE_PARSER_CLAUSE(OmpTaskReductionClause, OMPC_task_reduction)
 
 // Restrictions specific to each clause are implemented apart from the
 // generalized restrictions.
diff --git a/flang/test/Semantics/omp-clause-validity01.f90 b/flang/test/Semantics/omp-clause-validity01.f90
--- a/flang/test/Semantics/omp-clause-validity01.f90
+++ b/flang/test/Semantics/omp-clause-validity01.f90
@@ -349,7 +349,8 @@
 !                      collapse-clause
 
   a = 0.0
-  !$omp simd private(b) reduction(+:a)
+  !ERROR: TASK_REDUCTION clause is not allowed on the SIMD directive
+  !$omp simd private(b) reduction(+:a) task_reduction(+:a)
   do i = 1, N
      a = a + b + 3.14
   enddo
@@ -449,7 +450,8 @@
   enddo
 
   !ERROR: At most one NUM_TASKS clause can appear on the TASKLOOP directive
-  !$omp taskloop num_tasks(3) num_tasks(2)
+  !ERROR: TASK_REDUCTION clause is not allowed on the TASKLOOP directive
+  !$omp taskloop num_tasks(3) num_tasks(2) task_reduction(*:a)
   do i = 1,N
     a = 3.14
   enddo
diff --git a/llvm/include/llvm/Frontend/OpenMP/OMP.td b/llvm/include/llvm/Frontend/OpenMP/OMP.td
--- a/llvm/include/llvm/Frontend/OpenMP/OMP.td
+++ b/llvm/include/llvm/Frontend/OpenMP/OMP.td
@@ -232,6 +232,7 @@
 }
 def OMPC_TaskReduction : Clause<"task_reduction"> {
   let clangClass = "OMPTaskReductionClause";
+  let flangClass = "OmpTaskReductionClause";
 }
 def OMPC_InReduction : Clause<"in_reduction"> {
   let clangClass = "OMPInReductionClause";