diff --git a/core/ir/ir.h b/core/ir/ir.h
index 87bae52645..8e64aa4e10 100644
--- a/core/ir/ir.h
+++ b/core/ir/ir.h
@@ -2,6 +2,7 @@
 
 #include <vector>
 #include "NvInfer.h"
+// #include "trtorch.h"
 
 namespace trtorch {
 namespace core {
@@ -18,6 +19,17 @@ struct InputRange {
   InputRange(std::vector<int64_t> min_shape, std::vector<int64_t> opt_shape, std::vector<int64_t> max_shape);
 };
 
+// struct Input{
+//   Input(std::vector<int64_t> shape);
+//   Input(std::vector<int64_t> min_shape, std::vector<int64_t> opt_shape, std::vector<int64_t> max_shape);
+//   Input(std::vector<int64_t> shape, DataType dtype=DataType::kFloat32);
+//   Input(std::vector<int64_t> min_shape, std::vector<int64_t> opt_shape, std::vector<int64_t> max_shape, DataType dtype=DataType::kFloat32);
+//   nvinfer1::Dims min;
+//   nvinfer1::Dims max;
+//   nvinfer1::Dims opt;
+//   nvinfer1::DataType dtype;
+// }
+
 } // namespace ir
 } // namespace core
-} // namespace trtorch
\ No newline at end of file
+} // namespace trtorch
diff --git a/cpp/api/include/trtorch/trtorch.h b/cpp/api/include/trtorch/trtorch.h
index a1156a1338..043ba41b58 100644
--- a/cpp/api/include/trtorch/trtorch.h
+++ b/cpp/api/include/trtorch/trtorch.h
@@ -191,6 +191,59 @@ struct TRTORCH_API CompileSpec {
     Value value;
   };
 
+  /**
+   * @brief A struct to hold Input of a network.
+   * This struct has all the info (shape, dtype, name, memory_format) of an input tensor.
+   * The shape field in this struct can either hold a single vector representing an input shape,
+   * signifying a static input shape or a set of three input shapes representing
+   * the min, optiminal and max input shapes allowed for the engine.
+   * dtype : This can take values among values supported by trtorch::DataType
+   */
+  struct TRTORCH_API Input {
+    /// Minimum acceptable input size into the engine
+    std::vector<int64_t> min;
+    /// Optimal input size into the engine (gets best performace)
+    std::vector<int64_t> opt;
+    /// Maximum acceptable input size into the engine
+    std::vector<int64_t> max;
+    /// Data type of the input
+    DataType dtype;
+
+    /**
+     * @brief Construct a new Input Range object for static input size from
+     * vector
+     *
+     * @param opt
+     */
+    Input(std::vector<int64_t> opt, DataType dtype=DataType::kFloat);
+    /**
+     * @brief Construct a new Input Range object static input size from
+     * c10::ArrayRef (the type produced by tensor.sizes())
+     *
+     * @param opt
+     */
+    Input(c10::ArrayRef<int64_t> opt, DataType dtype=DataType::kFloat);
+    /**
+     * @brief Construct a new Input Range object dynamic input size from vectors
+     * for min, opt, and max supported sizes
+     *
+     * @param min
+     * @param opt
+     * @param max
+     */
+    Input(std::vector<int64_t> min, std::vector<int64_t> opt, std::vector<int64_t> max, DataType dtype=DataType::kFloat);
+    /**
+     * @brief Construct a new Input Range object dynamic input size from
+     * c10::ArrayRef (the type produced by tensor.sizes()) for min, opt, and max
+     * supported sizes
+     *
+     * @param min
+     * @param opt
+     * @param max
+     */
+    Input(c10::ArrayRef<int64_t> min, c10::ArrayRef<int64_t> opt, c10::ArrayRef<int64_t> max, DataType dtype=DataType::kFloat);
+  };
+
   /**
    * Emum for selecting engine capability
    */
diff --git a/cpp/api/src/compile_spec.cpp b/cpp/api/src/compile_spec.cpp
index aea4cfd68f..29a6a9adea 100644
--- a/cpp/api/src/compile_spec.cpp
+++ b/cpp/api/src/compile_spec.cpp
@@ -71,6 +71,33 @@ CompileSpec::CompileSpec(std::vector<std::vector<int64_t>> fixed_sizes) {
   }
 }
 
+/* ====== DEFINE INPUTS CLASS MEMBERS ======*/
+CompileSpec::Input::Input(std::vector<int64_t> opt) {
+  this->opt = opt;
+  this->min = opt;
+  this->max = opt;
+}
+
+CompileSpec::Input::Input(c10::IntArrayRef opt) {
+  this->opt = core::util::toVec(opt);
+  this->min = core::util::toVec(opt);
+  this->max = core::util::toVec(opt);
+}
+
+CompileSpec::Input::Input(std::vector<int64_t> min, std::vector<int64_t> opt, std::vector<int64_t> max) {
+  this->opt = opt;
+  this->min = min;
+  this->max = max;
+}
+
+CompileSpec::Input::Input(c10::IntArrayRef min, c10::IntArrayRef opt, c10::IntArrayRef max) {
+  this->opt = core::util::toVec(opt);
+  this->min = core::util::toVec(min);
+  this->max = core::util::toVec(max);
+}
+
+/* ==========================================*/
+
 core::ir::InputRange to_internal_input_range(CompileSpec::InputRange i) {
   return core::ir::InputRange(i.min, i.opt, i.max);
 }