diff --git a/tmva/sofie/CMakeLists.txt b/tmva/sofie/CMakeLists.txt
index 395af4a9ad104..7a3e74225d23c 100644
--- a/tmva/sofie/CMakeLists.txt
+++ b/tmva/sofie/CMakeLists.txt
@@ -72,6 +72,7 @@ ROOT_STANDARD_LIBRARY_PACKAGE(ROOTTMVASofie
    TMVA/ROperator_Not.hxx
    TMVA/ROperator_Clip.hxx
    TMVA/ROperator_Gelu.hxx
+   TMVA/ROperator_HardSigmoid.hxx
    TMVA/SOFIE_common.hxx
    TMVA/SOFIEHelpers.hxx
 
diff --git a/tmva/sofie/inc/TMVA/ROperator_HardSigmoid.hxx b/tmva/sofie/inc/TMVA/ROperator_HardSigmoid.hxx
new file mode 100644
index 0000000000000..ede5ff8650537
--- /dev/null
+++ b/tmva/sofie/inc/TMVA/ROperator_HardSigmoid.hxx
@@ -0,0 +1,86 @@
+#ifndef TMVA_SOFIE_ROPERATOR_HARDSIGMOID
+#define TMVA_SOFIE_ROPERATOR_HARDSIGMOID
+
+#include "TMVA/SOFIE_common.hxx"
+#include "TMVA/ROperator.hxx"
+#include "TMVA/RModel.hxx"
+
+#include <sstream>
+
+namespace TMVA {
+namespace Experimental {
+namespace SOFIE {
+
+template <typename T>
+class ROperator_HardSigmoid final : public ROperator {
+
+private:
+   float fAlpha = 0.2;
+   float fBeta = 0.5;
+   std::string fNX;
+   std::string fNY;
+   std::vector<size_t> fShape;
+   std::string fType;
+
+public:
+   ROperator_HardSigmoid() {}
+   ROperator_HardSigmoid(float alpha, float beta, std::string nameX, std::string nameY)
+      : fAlpha(alpha), fBeta(beta), fNX(UTILITY::Clean_name(nameX)), fNY(UTILITY::Clean_name(nameY))
+   {
+      if (std::is_same<T, float>::value) {
+         fType = "float";
+      } else {
+         throw std::runtime_error("TMVA SOFIE Encountered unsupported type parsing a HardSigmoid operator");
+      }
+
+      fInputTensorNames = {fNX};
+      fOutputTensorNames = {fNY};
+   }
+
+   std::vector<ETensorType> TypeInference(std::vector<ETensorType> input) override { return input; }
+
+   std::vector<std::vector<size_t>> ShapeInference(std::vector<std::vector<size_t>> input) override
+   {
+      auto ret = input; // suggest copy to compiler
+      return ret;
+   }
+
+   void Initialize(RModel &model) override
+   {
+      if (model.CheckIfTensorAlreadyExist(fNX) == false) {
+         throw std::runtime_error("TMVA SOFIE HardSigmoid Op Input Tensor is not found in model");
+      }
+      fShape = model.GetTensorShape(fNX);
+      model.AddIntermediateTensor(fNY, model.GetTensorType(fNX), fShape);
+   }
+
+   std::string Generate(std::string OpName) override
+   {
+      OpName = "op_" + OpName;
+      if (fShape.empty()) {
+         throw std::runtime_error("TMVA SOFIE Operator HardSigmoid called to Generate without being initialized first");
+      }
+      std::stringstream out;
+      size_t length = ConvertShapeToLength(fShape);
+
+      out << SP << "constexpr float " << OpName
+          << "_alpha = " << std::setprecision(std::numeric_limits<float>::max_digits10) << fAlpha << ";\n";
+      out << SP << "constexpr float " << OpName
+          << "_beta = " << std::setprecision(std::numeric_limits<float>::max_digits10) << fBeta << ";\n";
+
+      out << "\n//------ HardSigmoid\n";
+      out << SP << "for (int id = 0; id < " << length << " ; id++){\n";
+      out << SP << SP << "tensor_" << fNY << "[id] = std::max(0.0f, std::min(1.0f, " << OpName << "_alpha * tensor_"
+          << fNX << "[id] + " << OpName << "_beta));\n";
+      out << SP << "}\n";
+      return out.str();
+   }
+
+   std::vector<std::string> GetStdLibs() override { return {std::string("algorithm")}; }
+};
+
+} // namespace SOFIE
+} // namespace Experimental
+} // namespace TMVA
+
+#endif // TMVA_SOFIE_ROPERATOR_HARDSIGMOID
diff --git a/tmva/sofie/test/TestCustomModelsFromONNX.cxx b/tmva/sofie/test/TestCustomModelsFromONNX.cxx
index 75d341495b65f..80dd5c395eae8 100644
--- a/tmva/sofie/test/TestCustomModelsFromONNX.cxx
+++ b/tmva/sofie/test/TestCustomModelsFromONNX.cxx
@@ -93,6 +93,7 @@ constexpr auto modelDataSuffix = "_FromONNX.dat";
 #include "input_models/references/Log.ref.hxx"
 #include "input_models/references/Elu.ref.hxx"
 #include "input_models/references/Gelu.ref.hxx"
+#include "input_models/references/HardSigmoid.ref.hxx"
 #include "input_models/references/Equal.ref.hxx"
 #include "input_models/references/EluAlpha.ref.hxx"
 #include "input_models/references/LessOrEqual.ref.hxx"
@@ -3195,3 +3196,23 @@ TEST(ONNX, Gelu)
       EXPECT_LE(std::abs(output[i] - correct[i]), TOLERANCE);
    }
 }
+
+TEST(ONNX, HardSigmoid)
+{
+   constexpr float TOLERANCE = DEFAULT_TOLERANCE;
+
+   // Preparing the standard input
+   std::vector<float> input{1.0, -2.0, 3.0, 0.5, -1.0, 2.0};
+
+   ASSERT_INCLUDE_AND_RUN(std::vector<float>, "HardSigmoid", input);
+
+   // Checking output size
+   EXPECT_EQ(output.size(), std::size(HardSigmoid_ExpectedOutput::outputs));
+
+   float *correct = HardSigmoid_ExpectedOutput::outputs;
+
+   // Checking every output value, one by one
+   for (size_t i = 0; i < output.size(); ++i) {
+      EXPECT_LE(std::abs(output[i] - correct[i]), TOLERANCE);
+   }
+}
diff --git a/tmva/sofie/test/input_models/HardSigmoid.onnx b/tmva/sofie/test/input_models/HardSigmoid.onnx
new file mode 100644
index 0000000000000..df4952c4992b9
Binary files /dev/null and b/tmva/sofie/test/input_models/HardSigmoid.onnx differ
diff --git a/tmva/sofie/test/input_models/references/HardSigmoid.ref.hxx b/tmva/sofie/test/input_models/references/HardSigmoid.ref.hxx
new file mode 100644
index 0000000000000..67b8db1e1ed75
--- /dev/null
+++ b/tmva/sofie/test/input_models/references/HardSigmoid.ref.hxx
@@ -0,0 +1,3 @@
+namespace HardSigmoid_ExpectedOutput {
+float outputs[] = {0.700000f, 0.100000f, 1.000000f, 0.600000f, 0.300000f, 0.900000f};
+} // namespace HardSigmoid_ExpectedOutput
diff --git a/tmva/sofie_parsers/CMakeLists.txt b/tmva/sofie_parsers/CMakeLists.txt
index 4814b62c6ec51..957c43ec4b6b0 100644
--- a/tmva/sofie_parsers/CMakeLists.txt
+++ b/tmva/sofie_parsers/CMakeLists.txt
@@ -81,6 +81,7 @@ ROOT_STANDARD_LIBRARY_PACKAGE(ROOTTMVASofieParser
     src/ParseNot.cxx
     src/ParseClip.cxx
     src/ParseGelu.cxx
+    src/ParseHardSigmoid.cxx
     ${PROTO_SRCS}
   LIBRARIES PUBLIC
     protobuf::libprotobuf
diff --git a/tmva/sofie_parsers/src/ParseHardSigmoid.cxx b/tmva/sofie_parsers/src/ParseHardSigmoid.cxx
new file mode 100644
index 0000000000000..3d3222cf7c30b
--- /dev/null
+++ b/tmva/sofie_parsers/src/ParseHardSigmoid.cxx
@@ -0,0 +1,52 @@
+#include "TMVA/RModelParser_ONNX.hxx"
+#include "TMVA/ROperator_HardSigmoid.hxx"
+#include "onnx_proto3.pb.h"
+
+namespace TMVA {
+namespace Experimental {
+namespace SOFIE {
+
+ParserFuncSignature ParseHardSigmoid = [](RModelParser_ONNX &parser, const onnx::NodeProto &nodeproto) {
+   ETensorType input_type;
+
+   auto input_name = nodeproto.input(0);
+   if (parser.IsRegisteredTensorType(input_name)) {
+      input_type = parser.GetTensorType(input_name);
+   } else {
+      throw std::runtime_error("TMVA::SOFIE ONNX Parser HardSigmoid op has input tensor" + input_name +
+                               " but its type is not yet registered");
+   }
+
+   std::unique_ptr<ROperator> op;
+
+   float attr_alpha = 0.2;
+   float attr_beta = 0.5;
+
+   for (int_t i = 0; i < nodeproto.attribute_size(); i++) {
+      std::string attribute_name = nodeproto.attribute(i).name();
+      if (attribute_name == "alpha")
+         attr_alpha = nodeproto.attribute(i).f();
+      if (attribute_name == "beta")
+         attr_beta = nodeproto.attribute(i).f();
+   }
+
+   std::string output_name = nodeproto.output(0);
+   switch (input_type) {
+   case ETensorType::FLOAT:
+      op.reset(new ROperator_HardSigmoid<float>(attr_alpha, attr_beta, input_name, output_name));
+      break;
+   default:
+      throw std::runtime_error("TMVA::SOFIE - Unsupported - Operator HardSigmoid does not yet support input type " +
+                               std::to_string(static_cast<int>(input_type)));
+   }
+
+   if (!parser.IsRegisteredTensorType(output_name)) {
+      parser.RegisterTensorType(output_name, input_type);
+   }
+
+   return op;
+};
+
+} // namespace SOFIE
+} // namespace Experimental
+} // namespace TMVA
diff --git a/tmva/sofie_parsers/src/RModelParser_ONNX.cxx b/tmva/sofie_parsers/src/RModelParser_ONNX.cxx
index aa444c05d5f76..c76de40ae6dc5 100644
--- a/tmva/sofie_parsers/src/RModelParser_ONNX.cxx
+++ b/tmva/sofie_parsers/src/RModelParser_ONNX.cxx
@@ -86,6 +86,7 @@ extern ParserFuncSignature ParseGather;
 extern ParserFuncSignature ParseGatherND;
 extern ParserFuncSignature ParseErf;
 extern ParserFuncSignature ParseElu;
+extern ParserFuncSignature ParseHardSigmoid;
 extern ParserFuncSignature ParseEyeLike;
 extern ParserFuncSignature ParseRange;
 extern ParserFuncSignature ParseTopK;
@@ -324,6 +325,7 @@ RModelParser_ONNX::RModelParser_ONNX() noexcept : fOperatorsMapImpl(std::make_un
    RegisterOperator("GatherND", ParseGatherND);
    RegisterOperator("Erf", ParseErf);
    RegisterOperator("Elu", ParseElu);
+   RegisterOperator("HardSigmoid", ParseHardSigmoid);
    RegisterOperator("EyeLike", ParseEyeLike);
    RegisterOperator("Range", ParseRange);
    RegisterOperator("TopK", ParseTopK);