diff --git a/lib/Conversion/TorchOnnxToTorch/DefaultDomainQtoZ.cpp b/lib/Conversion/TorchOnnxToTorch/DefaultDomainQtoZ.cpp
index d26601c0de8d..7d34f14b4e70 100644
--- a/lib/Conversion/TorchOnnxToTorch/DefaultDomainQtoZ.cpp
+++ b/lib/Conversion/TorchOnnxToTorch/DefaultDomainQtoZ.cpp
@@ -962,6 +962,32 @@ void mlir::torch::onnx_c::populateDefaultDomainQtoZ(
                                         /*storeValue=*/data, keepDims,
                                         noop_with_empty_axes, false);
                 });
+  patterns.onOp("ReduceLogSum", 1,
+                [](OpBinder binder, ConversionPatternRewriter &rewriter) {
+                  Torch::ValueTensorType resultType;
+                  Value data;
+                  int64_t keepDims, noop_with_empty_axes;
+                  if (binder.tensorOperandAtIndex(data, 0) ||
+                      binder.tensorResultType(resultType) ||
+                      binder.s64IntegerAttr(keepDims, "keepdims", 1) ||
+                      binder.s64IntegerAttr(noop_with_empty_axes,
+                                            "noop_with_empty_axes", 0))
+                    return failure();
+
+                  auto reducedSumBool =
+                      reducedSumImpl(binder, rewriter, data, resultType,
+                                     /*storeValue=*/data, keepDims,
+                                     noop_with_empty_axes, true);
+
+                  if (failed(reducedSumBool))
+                    return rewriter.notifyMatchFailure(
+                        binder.op,
+                        "Failed to perform sum operation on square of operand");
+
+                  rewriter.replaceOpWithNewOp<Torch::AtenLogOp>(
+                      binder.op, resultType, data);
+                  return success();
+                });
   patterns.onOp(
       "ReduceMean", 1,
       [](OpBinder binder, ConversionPatternRewriter &rewriter) {
diff --git a/test/Conversion/TorchOnnxToTorch/simple_ops_q_to_z.mlir b/test/Conversion/TorchOnnxToTorch/simple_ops_q_to_z.mlir
index c8d513a31d21..e3519a89a73e 100644
--- a/test/Conversion/TorchOnnxToTorch/simple_ops_q_to_z.mlir
+++ b/test/Conversion/TorchOnnxToTorch/simple_ops_q_to_z.mlir
@@ -942,6 +942,57 @@ func.func @test_reduce_sum_negative_axes_keepdims_example(%arg0: !torch.vtensor<
 
 // -----
 
+// CHECK-LABEL: func.func @test_reduce_log_sum_default_axes_keepdims_example
+func.func @test_reduce_log_sum_default_axes_keepdims_example(%arg0: !torch.vtensor<[3,2,2],f32>, %arg1: !torch.vtensor<[0],si64>) -> !torch.vtensor<[1,1,1],f32> attributes {torch.onnx_meta.ir_version = 8 : si64, torch.onnx_meta.opset_version = 18 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
+  // CHECK: %[[INT0:.+]] = torch.constant.int 0
+  // CHECK: %[[DIMS:.+]] = torch.prim.ListConstruct  : () -> !torch.list<int>
+  // CHECK: %[[TRUE:.+]] = torch.constant.bool true
+  // CHECK: %[[NONE:.+]] = torch.constant.none
+  // CHECK: %[[SUM:.+]] = torch.aten.sum.dim_IntList %arg0, %[[DIMS]], %[[TRUE]], %[[NONE]] : !torch.vtensor<[3,2,2],f32>, !torch.list<int>, !torch.bool, !torch.none -> !torch.vtensor<[1,1,1],f32>
+  // CHECK: %[[LOG:.+]] = torch.aten.log %[[SUM]] : !torch.vtensor<[1,1,1],f32> -> !torch.vtensor<[1,1,1],f32>
+  // CHECK: return %[[LOG]] : !torch.vtensor<[1,1,1],f32>
+  %0 = torch.operator "onnx.ReduceLogSum"(%arg0, %arg1) {torch.onnx.keepdims = 1 : si64} : (!torch.vtensor<[3,2,2],f32>, !torch.vtensor<[0],si64>) -> !torch.vtensor<[1,1,1],f32>
+  return %0 : !torch.vtensor<[1,1,1],f32>
+}
+
+// -----
+
+// CHECK-LABEL: func.func @test_reduce_log_sum_keep_dims_example
+func.func @test_reduce_log_sum_keep_dims_example(%arg0: !torch.vtensor<[3,2,2],f32>, %arg1: !torch.vtensor<[1],si64>) -> !torch.vtensor<[3,2,1],f32> attributes {torch.onnx_meta.ir_version = 8 : si64, torch.onnx_meta.opset_version = 18 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
+  // CHECK: %[[INT0:.+]] = torch.constant.int 0
+  // CHECK: %[[INT0_0:.+]] = torch.constant.int 0
+  // CHECK: %[[SELECT:.+]] = torch.aten.select.int %arg1, %[[INT0]], %[[INT0_0]] : !torch.vtensor<[1],si64>, !torch.int, !torch.int -> !torch.vtensor<[1],si64>
+  // CHECK: %[[ITEM:.+]] = torch.aten.item %[[SELECT]] : !torch.vtensor<[1],si64> -> !torch.int
+  // CHECK: %[[DIMS:.+]] = torch.prim.ListConstruct %[[ITEM]] : (!torch.int) -> !torch.list<int>
+  // CHECK: %[[TRUE:.+]] = torch.constant.bool true
+  // CHECK: %[[NONE:.+]] = torch.constant.none
+  // CHECK: %[[SUM:.+]] = torch.aten.sum.dim_IntList %arg0, %[[DIMS]], %[[TRUE]], %[[NONE]] : !torch.vtensor<[3,2,2],f32>, !torch.list<int>, !torch.bool, !torch.none -> !torch.vtensor<[3,2,1],f32>
+  // CHECK: %[[LOG:.+]] = torch.aten.log %[[SUM]] : !torch.vtensor<[3,2,1],f32> -> !torch.vtensor<[3,2,1],f32>
+  // CHECK: return %[[LOG]] : !torch.vtensor<[3,2,1],f32>
+  %0 = torch.operator "onnx.ReduceLogSum"(%arg0, %arg1) {torch.onnx.keepdims = 1 : si64} : (!torch.vtensor<[3,2,2],f32>, !torch.vtensor<[1],si64>) -> !torch.vtensor<[3,2,1],f32>
+  return %0 : !torch.vtensor<[3,2,1],f32>
+}
+
+// -----
+
+// CHECK-LABEL: func.func @test_reduce_log_sum_do_not_keepdims_example
+func.func @test_reduce_log_sum_do_not_keepdims_example(%arg0:!torch.vtensor<[3,2,2],f32>, %arg1:!torch.vtensor<[1],si64>) -> !torch.vtensor<[3,2],f32> attributes {torch.onnx_meta.ir_version = 8 : si64, torch.onnx_meta.opset_version = 18 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
+  // CHECK: %[[INT0:.+]] = torch.constant.int 0
+  // CHECK: %[[INT0_0:.+]] = torch.constant.int 0
+  // CHECK: %[[SELECT:.+]] = torch.aten.select.int %arg1, %[[INT0]], %[[INT0_0]] : !torch.vtensor<[1],si64>, !torch.int, !torch.int -> !torch.vtensor<[1],si64>
+  // CHECK: %[[ITEM:.+]] = torch.aten.item %[[SELECT]] : !torch.vtensor<[1],si64> -> !torch.int
+  // CHECK: %[[DIMS:.+]] = torch.prim.ListConstruct %[[ITEM]] : (!torch.int) -> !torch.list<int>
+  // CHECK: %[[FALSE:.+]] = torch.constant.bool false
+  // CHECK: %[[NONE:.+]] = torch.constant.none
+  // CHECK: %[[SUM:.+]] = torch.aten.sum.dim_IntList %arg0, %[[DIMS]], %[[FALSE]], %[[NONE]] : !torch.vtensor<[3,2,2],f32>, !torch.list<int>, !torch.bool, !torch.none -> !torch.vtensor<[3,2],f32>
+  // CHECK: %[[LOG:.+]] = torch.aten.log %[[SUM]] : !torch.vtensor<[3,2],f32> -> !torch.vtensor<[3,2],f32>
+  // CHECK: return %[[LOG]] : !torch.vtensor<[3,2],f32>
+  %0 = torch.operator "onnx.ReduceLogSum"(%arg0, %arg1) {torch.onnx.keepdims = 0 : si64} : (!torch.vtensor<[3,2,2],f32>, !torch.vtensor<[1],si64>) -> !torch.vtensor<[3,2],f32>
+  return %0 : !torch.vtensor<[3,2],f32>
+}
+
+// -----
+
 // CHECK-LABEL: @test_reduce_mean_negative_axes_keepdims_example
 func.func @test_reduce_mean_negative_axes_keepdims_example(%arg0: !torch.vtensor<[3,2,2],f32>) -> !torch.vtensor<[3,1,2],f32> attributes {torch.onnx_meta.ir_version = 7 : si64, torch.onnx_meta.opset_version = 13 : si64} {
   // CHECK:  %[[TENSOR:.+]] = torch.vtensor.literal(dense<-2> : tensor<1xsi64>) : !torch.vtensor<[1],si64>