diff --git a/modules/dnn/test/test_onnx_importer.cpp b/modules/dnn/test/test_onnx_importer.cpp
index 4d56cb0e17..dc8d7dc0a0 100644
--- a/modules/dnn/test/test_onnx_importer.cpp
+++ b/modules/dnn/test/test_onnx_importer.cpp
@@ -2666,24 +2666,36 @@ void yoloPostProcessing(
         cv::transposeND(outs[0], {0, 2, 1}, outs[0]);
     }
 
-    // each row is [cx, cy, w, h, conf_obj, conf_class1, ..., conf_class80]
+    if (test_name == "yolonas"){
+        // outs contains 2 elemets of shape [1, 8400, 80] and [1, 8400, 4]. Concat them to get [1, 8400, 84]
+        Mat concat_out;
+        // squeeze the first dimension
+        outs[0] = outs[0].reshape(1, outs[0].size[1]);
+        outs[1] = outs[1].reshape(1, outs[1].size[1]);
+        cv::hconcat(outs[1], outs[0], concat_out);
+        outs[0] = concat_out;
+        // remove the second element
+        outs.pop_back();
+        // unsqueeze the first dimension
+        outs[0] = outs[0].reshape(0, std::vector<int>{1, 8400, 84});
+    }
+
     for (auto preds : outs){
 
         preds = preds.reshape(1, preds.size[1]); // [1, 8400, 85] -> [8400, 85]
-
         for (int i = 0; i < preds.rows; ++i)
         {
-            // filter out non objects
-            float obj_conf = (test_name != "yolov8") ? preds.at<float>(i, 4) : 1.0f;
+            // filter out non object
+            float obj_conf = (test_name == "yolov8" || test_name == "yolonas") ? 1.0f : preds.at<float>(i, 4) ;
             if (obj_conf < conf_threshold)
                 continue;
 
-            Mat scores = preds.row(i).colRange((test_name != "yolov8") ? 5 : 4, preds.cols);
+            Mat scores = preds.row(i).colRange((test_name == "yolov8" || test_name == "yolonas") ? 4 : 5, preds.cols);
             double conf;
             Point maxLoc;
             minMaxLoc(scores, 0, &conf, 0, &maxLoc);
 
-            conf = (test_name != "yolov8") ? conf * obj_conf : conf;
+            conf = (test_name == "yolov8" || test_name == "yolonas") ? conf : conf * obj_conf;
             if (conf < conf_threshold)
                 continue;
 
@@ -2694,10 +2706,15 @@ void yoloPostProcessing(
             double w = det[2];
             double h = det[3];
 
+            // std::cout << "cx: " << cx << " cy: " << cy << " w: " << w << " h: " << h << " conf: " << conf << " idx: " << maxLoc.x << std::endl;
             // [x1, y1, x2, y2]
-            boxes.push_back(Rect2d(cx - 0.5 * w, cy - 0.5 * h,
-                                    cx + 0.5 * w, cy + 0.5 * h));
-            classIds.push_back(maxLoc.x);
+            if (test_name == "yolonas"){
+                boxes.push_back(Rect2d(cx, cy, w, h));
+            } else {
+                boxes.push_back(Rect2d(cx - 0.5 * w, cy - 0.5 * h,
+                                        cx + 0.5 * w, cy + 0.5 * h));
+            }
+           classIds.push_back(maxLoc.x);
             confidences.push_back(conf);
         }
     }
@@ -2751,6 +2768,41 @@ TEST_P(Test_ONNX_nets, YOLOX)
         1.0e-4, 1.0e-4);
 }
 
+TEST_P(Test_ONNX_nets, YOLONas)
+{
+    // model information: https://dl.opencv.org/models/yolo-nas/Readme.md
+    std::string weightPath = _tf("models/yolo_nas_s.onnx", false);
+
+    Size targetSize{640, 640};
+    float conf_threshold = 0.50;
+    float iou_threshold = 0.50;
+
+    std::vector<int> refClassIds{1, 16, 7};
+    std::vector<float> refScores{0.9720f, 0.9283f, 0.8990f};
+    // [x1, y1, x2, y2]
+    std::vector<Rect2d> refBoxes{
+        Rect2d(105.516, 173.696, 471.323, 430.433),
+        Rect2d(109.241, 263.406, 259.872, 531.858),
+        Rect2d(390.153, 142.492, 574.932, 222.709)
+        };
+
+    Image2BlobParams imgParams(
+        Scalar::all(1/255.0),
+        targetSize,
+        Scalar::all(0),
+        false,
+        CV_32F,
+        DNN_LAYOUT_NCHW,
+        DNN_PMODE_LETTERBOX,
+        Scalar::all(114)
+        );
+
+    testYOLO(
+        weightPath, refClassIds, refScores, refBoxes,
+        imgParams, conf_threshold, iou_threshold,
+        1.0e-4, 1.0e-4, "yolonas");
+}
+
 TEST_P(Test_ONNX_nets, YOLOv8)
 {
     std::string weightPath = _tf("models/yolov8n.onnx", false);