diff --git a/flang/lib/Lower/OpenACC.cpp b/flang/lib/Lower/OpenACC.cpp
--- a/flang/lib/Lower/OpenACC.cpp
+++ b/flang/lib/Lower/OpenACC.cpp
@@ -649,7 +649,8 @@
       op != mlir::acc::ReductionOperator::AccMul &&
       op != mlir::acc::ReductionOperator::AccMin &&
       op != mlir::acc::ReductionOperator::AccMax &&
-      op != mlir::acc::ReductionOperator::AccIand)
+      op != mlir::acc::ReductionOperator::AccIand &&
+      op != mlir::acc::ReductionOperator::AccIor)
     TODO(loc, "reduction operator");
 
   if (ty.isIntOrIndex())
@@ -756,6 +757,9 @@
   if (op == mlir::acc::ReductionOperator::AccIand)
     return builder.create<mlir::arith::AndIOp>(loc, value1, value2);
 
+  if (op == mlir::acc::ReductionOperator::AccIor)
+    return builder.create<mlir::arith::OrIOp>(loc, value1, value2);
+
   TODO(loc, "reduction operator");
 }
 
diff --git a/flang/test/Lower/OpenACC/acc-reduction.f90 b/flang/test/Lower/OpenACC/acc-reduction.f90
--- a/flang/test/Lower/OpenACC/acc-reduction.f90
+++ b/flang/test/Lower/OpenACC/acc-reduction.f90
@@ -2,6 +2,16 @@
 
 ! RUN: bbc -fopenacc -emit-fir %s -o - | FileCheck %s
 
+! CHECK-LABEL: acc.reduction.recipe @reduction_ior_i32 : i32 reduction_operator <ior> init {
+! CHECK: ^bb0(%{{.*}}: i32):
+! CHECK:   %[[CST:.*]] = arith.constant 0 : i32
+! CHECK:   acc.yield %[[CST]] : i32
+! CHECK: } combiner {
+! CHECK: ^bb0(%[[ARG0:.*]]: i32, %[[ARG1:.*]]: i32):
+! CHECK:   %[[COMBINED:.*]] = arith.ori %[[ARG0]], %[[ARG1]] : i32
+! CHECK:   acc.yield %[[COMBINED]] : i32
+! CHECK: }
+
 ! CHECK-LABEL: acc.reduction.recipe @reduction_iand_i32 : i32 reduction_operator <iand> init {
 ! CHECK: ^bb0(%{{.*}}: i32):
 ! CHECK:   %[[CST:.*]] = arith.constant -1 : i32
@@ -597,3 +607,13 @@
 ! CHECK-LABEL: func.func @_QPacc_reduction_iand()
 ! CHECK: %[[RED:.*]] = acc.reduction varPtr(%{{.*}} : !fir.ref<i32>)   -> !fir.ref<i32> {name = "i"}
 ! CHECK: acc.parallel   reduction(@reduction_iand_i32 -> %[[RED]] : !fir.ref<i32>)
+
+subroutine acc_reduction_ior()
+  integer :: i
+  !$acc parallel reduction(ior:i)
+  !$acc end parallel
+end subroutine
+
+! CHECK-LABEL: func.func @_QPacc_reduction_ior()
+! CHECK: %[[RED:.*]] = acc.reduction varPtr(%{{.*}} : !fir.ref<i32>)   -> !fir.ref<i32> {name = "i"}
+! CHECK: acc.parallel reduction(@reduction_ior_i32 -> %[[RED]] : !fir.ref<i32>)