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diff --git a/reference_model/src/ops/ewise_ternary.h b/reference_model/src/ops/ewise_ternary.h
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+++ b/reference_model/src/ops/ewise_ternary.h
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+
+// Copyright (c) 2020, ARM Limited.
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//         http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+
+#ifndef OPS_TERNARY_H
+#define OPS_TERNARY_H
+
+#include "graph_node.h"
+
+using namespace tosa;
+
+namespace TosaReference
+{
+
+// The Ternary Select op has the following operands:
+//   1.   Cond:   rank N, type=bool
+//   2.   Then_val: Rank N, type=<V>
+//   3.   Else_val: Rank N, type=<V>
+//   4.   Result:   Rank N, type=<V>
+// Cond, Then_val, Else_val need to be mutually-broadcastable
+template <int Rank, DType Dtype>
+class OpSelectBase : public GraphNode
+{
+public:
+    OpSelectBase(TosaAttributeBase* attribute_, TosaQuantInfoBase* qinfo_, uint64_t id_);
+    virtual ~OpSelectBase();
+
+    virtual int checkTensorAttributes();
+    virtual int eval();
+
+    using CondEigenType = typename GetEigenType<DType_BOOL>::type;
+    using InEigenType   = typename GetEigenType<Dtype>::type;
+    using TCond         = Eigen::Tensor<CondEigenType, Rank>;
+    using TIn           = Eigen::Tensor<InEigenType, Rank>;
+
+protected:
+    TosaReference::TensorTemplate<TCond>* cond;
+    Eigen::array<int, Rank> bcast_cond;
+    Eigen::array<int, Rank> bcast_then;
+    Eigen::array<int, Rank> bcast_else;
+    TosaReference::TensorTemplate<TIn>* then_val;
+    TosaReference::TensorTemplate<TIn>* else_val;
+    TosaReference::TensorTemplate<TIn>* out;
+};
+
+// primary class
+template <int Rank, DType Dtype>
+class OpSelect : public OpSelectBase<Rank, Dtype>
+{
+public:
+    OpSelect(TosaAttributeBase* attribute_, TosaQuantInfoBase* qinfo_, uint64_t id_)
+        : OpSelectBase<Rank, Dtype>(attribute_, qinfo_, id_)
+    {}
+    virtual int eval();
+    int broadcast();
+
+    using InEigenType = typename OpSelectBase<Rank, Dtype>::InEigenType;
+};
+
+// partial specialization for rank 0
+template <DType Dtype>
+class OpSelect<0, Dtype> : public OpSelectBase<0, Dtype>
+{
+public:
+    OpSelect(TosaAttributeBase* attribute_, TosaQuantInfoBase* qinfo_, uint64_t id_)
+        : OpSelectBase<0, Dtype>(attribute_, qinfo_, id_)
+    {}
+    virtual int eval();
+};
+};    // namespace TosaReference
+
+#endif