diff --git a/datadog/api/http_client.py b/datadog/api/http_client.py
index fa5be4280..6d1f599d9 100644
--- a/datadog/api/http_client.py
+++ b/datadog/api/http_client.py
@@ -9,7 +9,9 @@
 2. `urlfetch` 3p module - Google App Engine only
 """
 # stdlib
+import copy
 import logging
+import platform
 import urllib
 from threading import Lock
 
@@ -32,6 +34,16 @@
 log = logging.getLogger('datadog.api')
 
 
+def _get_user_agent_header():
+    from datadog import version
+    return 'datadogpy/{version} (python {pyver}; os {os}; arch {arch})'.format(
+        version=version.__version__,
+        pyver=platform.python_version(),
+        os=platform.system().lower(),
+        arch=platform.machine().lower(),
+    )
+
+
 def _remove_context(exc):
     """Python3: remove context from chained exceptions to prevent leaking API keys in tracebacks."""
     exc.__cause__ = None
@@ -79,6 +91,7 @@ def request(cls, method, url, headers, params, data, timeout, proxies, verify, m
                     cls._session = requests.Session()
                     http_adapter = requests.adapters.HTTPAdapter(max_retries=max_retries)
                     cls._session.mount('https://', http_adapter)
+                    cls._session.headers.update({'User-Agent': _get_user_agent_header()})
 
             result = cls._session.request(
                 method, url,
@@ -130,12 +143,14 @@ def request(cls, method, url, headers, params, data, timeout, proxies, verify, m
             url=url,
             params=urllib.urlencode(params)
         )
+        newheaders = copy.deepcopy(headers)
+        newheaders['User-Agent'] = _get_user_agent_header()
 
         try:
             result = urlfetch.fetch(
                 url=url_with_params,
                 method=method,
-                headers=headers,
+                headers=newheaders,
                 validate_certificate=validate_certificate,
                 deadline=timeout,
                 payload=data,
diff --git a/tests/integration/api/cassettes/TestDatadog.test_user_agent.yaml b/tests/integration/api/cassettes/TestDatadog.test_user_agent.yaml
new file mode 100644
index 000000000..6990a10a9
--- /dev/null
+++ b/tests/integration/api/cassettes/TestDatadog.test_user_agent.yaml
@@ -0,0 +1,51 @@
+interactions:
+- request:
+    body: null
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate
+      Connection:
+      - keep-alive
+      User-Agent:
+      - datadogpy/0.38.0.dev (python 3.7.7; os darwin; arch x86_64)
+    method: GET
+    uri: https://api.datadoghq.com/api/v1/validate
+  response:
+    body:
+      string: '{"valid":true}'
+    headers:
+      Cache-Control:
+      - no-cache
+      Connection:
+      - keep-alive
+      Content-Length:
+      - '14'
+      Content-Security-Policy:
+      - frame-ancestors 'self'; report-uri https://api.datadoghq.com/csp-report
+      Content-Type:
+      - application/json
+      DD-POOL:
+      - dogweb
+      Date:
+      - Wed, 01 Jul 2020 17:22:12 GMT
+      Pragma:
+      - no-cache
+      Set-Cookie:
+      - DD-PSHARD=89; Max-Age=604800; Path=/; expires=Wed, 08-Jul-2020 17:22:12 GMT;
+        secure; HttpOnly
+      Strict-Transport-Security:
+      - max-age=15724800;
+      X-Content-Type-Options:
+      - nosniff
+      X-DD-Debug:
+      - SaHvyR/hQzhMjBxXmmuM76vwlwfocpgL0LhX3u6R0CFONYqUGm7Xe/7/HyTliTFX
+      X-DD-VERSION:
+      - '35.2688709'
+      X-Frame-Options:
+      - SAMEORIGIN
+    status:
+      code: 200
+      message: OK
+version: 1
diff --git a/tests/integration/api/test_api.py b/tests/integration/api/test_api.py
index 8bce7a605..b69c7a434 100644
--- a/tests/integration/api/test_api.py
+++ b/tests/integration/api/test_api.py
@@ -4,7 +4,9 @@
 # python
 import datetime
 import json
+import mock
 import os
+import re
 import time
 
 import requests
@@ -959,3 +961,8 @@ def test_roles_crud(self, dog):
         # check if new role is deleted successfully
         res = dog.Roles.get(role_uuid)
         assert "errors" in res
+
+    @mock.patch('datadog.api._return_raw_response', True)
+    def test_user_agent(self, dog):
+        _, resp = dog.api_client.APIClient.submit('GET', 'validate')
+        assert re.match(r'^datadogpy\/[^\s]+ \(python [^\s]+; os [^\s]+; arch [^\s]+\)$', resp.request.headers['User-Agent'])
diff --git a/tox.ini b/tox.ini
index 31e054a44..37ddc062c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,9 +11,9 @@ envlist =
 passenv = DD_TEST_CLIENT*
 usedevelop = true
 deps =
-    !integration: mock
     click
     freezegun
+    mock
     pytest
     pytest-vcr
     python-dateutil
@@ -28,6 +28,7 @@ usedevelop = true
 deps =
     click
     freezegun
+    mock
     pytest
     pytest-vcr
     python-dateutil