diff --git a/finetune/tag_images_by_wd14_tagger.py b/finetune/tag_images_by_wd14_tagger.py
index 31ee93bc0..ffe94e7df 100644
--- a/finetune/tag_images_by_wd14_tagger.py
+++ b/finetune/tag_images_by_wd14_tagger.py
@@ -2,15 +2,14 @@
 import csv
 import glob
 import os
+from pathlib import Path
 
-from PIL import Image
 import cv2
-from tqdm import tqdm
 import numpy as np
-from tensorflow.keras.models import load_model
-from huggingface_hub import hf_hub_download
 import torch
-from pathlib import Path
+from huggingface_hub import hf_hub_download
+from PIL import Image
+from tqdm import tqdm
 
 import library.train_util as train_util
 
@@ -81,6 +80,8 @@ def main(args):
     # https://github.com/toriato/stable-diffusion-webui-wd14-tagger/issues/22
     if not os.path.exists(args.model_dir) or args.force_download:
         print(f"downloading wd14 tagger model from hf_hub. id: {args.repo_id}")
+        if args.onnx:
+            FILES.append("model.onnx")
         for file in FILES:
             hf_hub_download(args.repo_id, file, cache_dir=args.model_dir, force_download=True, force_filename=file)
         for file in SUB_DIR_FILES:
@@ -96,7 +97,35 @@ def main(args):
         print("using existing wd14 tagger model")
 
     # 画像を読み込む
-    model = load_model(args.model_dir)
+    if args.onnx:
+        import onnx
+        import onnxruntime as ort
+
+        onnx_path = f"{args.model_dir}/model.onnx"
+        print("Running wd14 tagger with onnx")
+        print(f"loading onnx model: {onnx_path}")
+        model = onnx.load(onnx_path)
+        input_name = model.graph.input[0].name
+        try:
+            batch_size = model.graph.input[0].type.tensor_type.shape.dim[0].dim_value
+        except:
+            batch_size = model.graph.input[0].type.tensor_type.shape.dim[0].dim_param
+        if args.batch_size != batch_size and type(batch_size) != str:
+            # some rebatch model may use 'N' as dynamic axes
+            print(
+                f"Batch size {args.batch_size} doesn't match onnx model batch size {batch_size}, use model batch size {batch_size}"
+            )
+            args.batch_size = batch_size
+        ort_sess = ort.InferenceSession(
+            onnx_path,
+            providers=["CUDAExecutionProvider"]
+            if "CUDAExecutionProvider" in ort.get_available_providers()
+            else ["CPUExecutionProvider"],
+        )
+    else:
+        from tensorflow.keras.models import load_model
+
+        model = load_model(f"{args.model_dir}")
 
     # label_names = pd.read_csv("2022_0000_0899_6549/selected_tags.csv")
     # 依存ライブラリを増やしたくないので自力で読むよ
@@ -124,8 +153,11 @@ def main(args):
     def run_batch(path_imgs):
         imgs = np.array([im for _, im in path_imgs])
 
-        probs = model(imgs, training=False)
-        probs = probs.numpy()
+        if args.onnx:
+            probs = ort_sess.run(None, {input_name: imgs})[0]  # onnx output numpy
+        else:
+            probs = model(imgs, training=False)
+            probs = probs.numpy()
 
         for (image_path, _), prob in zip(path_imgs, probs):
             # 最初の4つはratingなので無視する
@@ -301,6 +333,7 @@ def setup_parser() -> argparse.ArgumentParser:
         help="comma-separated list of undesired tags to remove from the output / 出力から除外したいタグのカンマ区切りのリスト",
     )
     parser.add_argument("--frequency_tags", action="store_true", help="Show frequency of tags for images / 画像ごとのタグの出現頻度を表示する")
+    parser.add_argument("--onnx", action="store_true", help="use onnx model for inference")
     parser.add_argument("--append_tags", action="store_true", help="Append captions instead of overwriting / 上書きではなくキャプションを追記する")
 
     return parser
diff --git a/requirements.txt b/requirements.txt
index 4ca393f52..75de48cb9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,8 +19,11 @@ huggingface-hub==0.15.1
 # requests==2.28.2
 # timm==0.6.12
 # fairscale==0.4.13
-# for WD14 captioning
+# for WD14 captioning (tensroflow or onnx)
 # tensorflow==2.10.1
+# onnx==1.14.1
+# onnxruntime-gpu==1.16.0
+# onnxruntime==1.16.0
 # open clip for SDXL
 open-clip-torch==2.20.0
 # for kohya_ss library