diff --git a/libs/langchain/langchain/llms/nlpcloud.py b/libs/langchain/langchain/llms/nlpcloud.py
index c359284bd19..a3ce770f5ef 100644
--- a/libs/langchain/langchain/llms/nlpcloud.py
+++ b/libs/langchain/langchain/llms/nlpcloud.py
@@ -1,10 +1,10 @@
 from typing import Any, Dict, List, Mapping, Optional
 
-from langchain_core.pydantic_v1 import Extra, root_validator
+from langchain_core.pydantic_v1 import Extra, SecretStr, root_validator
 
 from langchain.callbacks.manager import CallbackManagerForLLMRun
 from langchain.llms.base import LLM
-from langchain.utils import get_from_dict_or_env
+from langchain.utils import convert_to_secret_str, get_from_dict_or_env
 
 
 class NLPCloud(LLM):
@@ -50,7 +50,7 @@ class NLPCloud(LLM):
     num_return_sequences: int = 1
     """How many completions to generate for each prompt."""
 
-    nlpcloud_api_key: Optional[str] = None
+    nlpcloud_api_key: Optional[SecretStr] = None
 
     class Config:
         """Configuration for this pydantic object."""
@@ -60,15 +60,15 @@ class NLPCloud(LLM):
     @root_validator()
     def validate_environment(cls, values: Dict) -> Dict:
         """Validate that api key and python package exists in environment."""
-        nlpcloud_api_key = get_from_dict_or_env(
-            values, "nlpcloud_api_key", "NLPCLOUD_API_KEY"
+        values["nlpcloud_api_key"] = convert_to_secret_str(
+            get_from_dict_or_env(values, "nlpcloud_api_key", "NLPCLOUD_API_KEY")
         )
         try:
             import nlpcloud
 
             values["client"] = nlpcloud.Client(
                 values["model_name"],
-                nlpcloud_api_key,
+                values["nlpcloud_api_key"].get_secret_value(),
                 gpu=values["gpu"],
                 lang=values["lang"],
             )
diff --git a/libs/langchain/tests/integration_tests/llms/test_nlpcloud.py b/libs/langchain/tests/integration_tests/llms/test_nlpcloud.py
index 4c5ccca0d7d..4a64970ad8c 100644
--- a/libs/langchain/tests/integration_tests/llms/test_nlpcloud.py
+++ b/libs/langchain/tests/integration_tests/llms/test_nlpcloud.py
@@ -1,9 +1,13 @@
 """Test NLPCloud API wrapper."""
 
 from pathlib import Path
+from typing import cast
+
+from pytest import CaptureFixture, MonkeyPatch
 
 from langchain.llms.loading import load_llm
 from langchain.llms.nlpcloud import NLPCloud
+from langchain.pydantic_v1 import SecretStr
 from tests.integration_tests.llms.utils import assert_llm_equality
 
 
@@ -20,3 +24,20 @@ def test_saving_loading_llm(tmp_path: Path) -> None:
     llm.save(file_path=tmp_path / "nlpcloud.yaml")
     loaded_llm = load_llm(tmp_path / "nlpcloud.yaml")
     assert_llm_equality(llm, loaded_llm)
+
+
+def test_nlpcloud_api_key(monkeypatch: MonkeyPatch, capsys: CaptureFixture) -> None:
+    """Test that nlpcloud api key is a secret key."""
+    # test initialization from init
+    assert isinstance(NLPCloud(nlpcloud_api_key="1").nlpcloud_api_key, SecretStr)
+
+    monkeypatch.setenv("NLPCLOUD_API_KEY", "secret-api-key")
+    llm = NLPCloud()
+    assert isinstance(llm.nlpcloud_api_key, SecretStr)
+
+    assert cast(SecretStr, llm.nlpcloud_api_key).get_secret_value() == "secret-api-key"
+
+    print(llm.nlpcloud_api_key, end="")
+    captured = capsys.readouterr()
+
+    assert captured.out == "**********"