diff --git a/Lib/test/allsans.pem b/Lib/test/certdata/allsans.pem
similarity index 100%
rename from Lib/test/allsans.pem
rename to Lib/test/certdata/allsans.pem
diff --git a/Lib/test/badcert.pem b/Lib/test/certdata/badcert.pem
similarity index 100%
rename from Lib/test/badcert.pem
rename to Lib/test/certdata/badcert.pem
diff --git a/Lib/test/badkey.pem b/Lib/test/certdata/badkey.pem
similarity index 100%
rename from Lib/test/badkey.pem
rename to Lib/test/certdata/badkey.pem
diff --git a/Lib/test/capath/4e1295a3.0 b/Lib/test/certdata/capath/4e1295a3.0
similarity index 100%
rename from Lib/test/capath/4e1295a3.0
rename to Lib/test/certdata/capath/4e1295a3.0
diff --git a/Lib/test/capath/5ed36f99.0 b/Lib/test/certdata/capath/5ed36f99.0
similarity index 100%
rename from Lib/test/capath/5ed36f99.0
rename to Lib/test/certdata/capath/5ed36f99.0
diff --git a/Lib/test/capath/6e88d7b8.0 b/Lib/test/certdata/capath/6e88d7b8.0
similarity index 100%
rename from Lib/test/capath/6e88d7b8.0
rename to Lib/test/certdata/capath/6e88d7b8.0
diff --git a/Lib/test/capath/99d0fa06.0 b/Lib/test/certdata/capath/99d0fa06.0
similarity index 100%
rename from Lib/test/capath/99d0fa06.0
rename to Lib/test/certdata/capath/99d0fa06.0
diff --git a/Lib/test/capath/b1930218.0 b/Lib/test/certdata/capath/b1930218.0
similarity index 100%
rename from Lib/test/capath/b1930218.0
rename to Lib/test/certdata/capath/b1930218.0
diff --git a/Lib/test/capath/ceff1710.0 b/Lib/test/certdata/capath/ceff1710.0
similarity index 100%
rename from Lib/test/capath/ceff1710.0
rename to Lib/test/certdata/capath/ceff1710.0
diff --git a/Lib/test/ffdh3072.pem b/Lib/test/certdata/ffdh3072.pem
similarity index 100%
rename from Lib/test/ffdh3072.pem
rename to Lib/test/certdata/ffdh3072.pem
diff --git a/Lib/test/idnsans.pem b/Lib/test/certdata/idnsans.pem
similarity index 100%
rename from Lib/test/idnsans.pem
rename to Lib/test/certdata/idnsans.pem
diff --git a/Lib/test/keycert.passwd.pem b/Lib/test/certdata/keycert.passwd.pem
similarity index 100%
rename from Lib/test/keycert.passwd.pem
rename to Lib/test/certdata/keycert.passwd.pem
diff --git a/Lib/test/keycert.pem b/Lib/test/certdata/keycert.pem
similarity index 100%
rename from Lib/test/keycert.pem
rename to Lib/test/certdata/keycert.pem
diff --git a/Lib/test/keycert2.pem b/Lib/test/certdata/keycert2.pem
similarity index 100%
rename from Lib/test/keycert2.pem
rename to Lib/test/certdata/keycert2.pem
diff --git a/Lib/test/keycert3.pem b/Lib/test/certdata/keycert3.pem
similarity index 100%
rename from Lib/test/keycert3.pem
rename to Lib/test/certdata/keycert3.pem
diff --git a/Lib/test/keycert4.pem b/Lib/test/certdata/keycert4.pem
similarity index 100%
rename from Lib/test/keycert4.pem
rename to Lib/test/certdata/keycert4.pem
diff --git a/Lib/test/keycertecc.pem b/Lib/test/certdata/keycertecc.pem
similarity index 100%
rename from Lib/test/keycertecc.pem
rename to Lib/test/certdata/keycertecc.pem
diff --git a/Lib/test/make_ssl_certs.py b/Lib/test/certdata/make_ssl_certs.py
similarity index 100%
rename from Lib/test/make_ssl_certs.py
rename to Lib/test/certdata/make_ssl_certs.py
diff --git a/Lib/test/nokia.pem b/Lib/test/certdata/nokia.pem
similarity index 100%
rename from Lib/test/nokia.pem
rename to Lib/test/certdata/nokia.pem
diff --git a/Lib/test/nosan.pem b/Lib/test/certdata/nosan.pem
similarity index 100%
rename from Lib/test/nosan.pem
rename to Lib/test/certdata/nosan.pem
diff --git a/Lib/test/nullbytecert.pem b/Lib/test/certdata/nullbytecert.pem
similarity index 100%
rename from Lib/test/nullbytecert.pem
rename to Lib/test/certdata/nullbytecert.pem
diff --git a/Lib/test/nullcert.pem b/Lib/test/certdata/nullcert.pem
similarity index 100%
rename from Lib/test/nullcert.pem
rename to Lib/test/certdata/nullcert.pem
diff --git a/Lib/test/pycacert.pem b/Lib/test/certdata/pycacert.pem
similarity index 100%
rename from Lib/test/pycacert.pem
rename to Lib/test/certdata/pycacert.pem
diff --git a/Lib/test/pycakey.pem b/Lib/test/certdata/pycakey.pem
similarity index 100%
rename from Lib/test/pycakey.pem
rename to Lib/test/certdata/pycakey.pem
diff --git a/Lib/test/revocation.crl b/Lib/test/certdata/revocation.crl
similarity index 100%
rename from Lib/test/revocation.crl
rename to Lib/test/certdata/revocation.crl
diff --git a/Lib/test/secp384r1.pem b/Lib/test/certdata/secp384r1.pem
similarity index 100%
rename from Lib/test/secp384r1.pem
rename to Lib/test/certdata/secp384r1.pem
diff --git a/Lib/test/selfsigned_pythontestdotnet.pem b/Lib/test/certdata/selfsigned_pythontestdotnet.pem
similarity index 100%
rename from Lib/test/selfsigned_pythontestdotnet.pem
rename to Lib/test/certdata/selfsigned_pythontestdotnet.pem
diff --git a/Lib/test/ssl_cert.pem b/Lib/test/certdata/ssl_cert.pem
similarity index 100%
rename from Lib/test/ssl_cert.pem
rename to Lib/test/certdata/ssl_cert.pem
diff --git a/Lib/test/ssl_key.passwd.pem b/Lib/test/certdata/ssl_key.passwd.pem
similarity index 100%
rename from Lib/test/ssl_key.passwd.pem
rename to Lib/test/certdata/ssl_key.passwd.pem
diff --git a/Lib/test/ssl_key.pem b/Lib/test/certdata/ssl_key.pem
similarity index 100%
rename from Lib/test/ssl_key.pem
rename to Lib/test/certdata/ssl_key.pem
diff --git a/Lib/test/talos-2019-0758.pem b/Lib/test/certdata/talos-2019-0758.pem
similarity index 100%
rename from Lib/test/talos-2019-0758.pem
rename to Lib/test/certdata/talos-2019-0758.pem
diff --git a/Lib/test/ssl_servers.py b/Lib/test/ssl_servers.py
index a4bd7455d47..15b071e04dd 100644
--- a/Lib/test/ssl_servers.py
+++ b/Lib/test/ssl_servers.py
@@ -14,7 +14,7 @@ from test.support import socket_helper
 here = os.path.dirname(__file__)
 
 HOST = socket_helper.HOST
-CERTFILE = os.path.join(here, 'keycert.pem')
+CERTFILE = os.path.join(here, 'certdata', 'keycert.pem')
 
 # This one's based on HTTPServer, which is based on socketserver
 
diff --git a/Lib/test/test_asyncio/utils.py b/Lib/test/test_asyncio/utils.py
index 6dee5bb33b2..64eb4410bfb 100644
--- a/Lib/test/test_asyncio/utils.py
+++ b/Lib/test/test_asyncio/utils.py
@@ -36,21 +36,21 @@ from test.support import socket_helper
 from test.support import threading_helper
 
 
-def data_file(filename):
+def data_file(*filename):
     if hasattr(support, 'TEST_HOME_DIR'):
-        fullname = os.path.join(support.TEST_HOME_DIR, filename)
+        fullname = os.path.join(support.TEST_HOME_DIR, *filename)
         if os.path.isfile(fullname):
             return fullname
-    fullname = os.path.join(os.path.dirname(__file__), '..', filename)
+    fullname = os.path.join(os.path.dirname(__file__), '..', *filename)
     if os.path.isfile(fullname):
         return fullname
-    raise FileNotFoundError(filename)
+    raise FileNotFoundError(os.path.join(filename))
 
 
-ONLYCERT = data_file('ssl_cert.pem')
-ONLYKEY = data_file('ssl_key.pem')
-SIGNED_CERTFILE = data_file('keycert3.pem')
-SIGNING_CA = data_file('pycacert.pem')
+ONLYCERT = data_file('certdata', 'ssl_cert.pem')
+ONLYKEY = data_file('certdata', 'ssl_key.pem')
+SIGNED_CERTFILE = data_file('certdata', 'keycert3.pem')
+SIGNING_CA = data_file('certdata', 'pycacert.pem')
 PEERCERT = {
     'OCSP': ('http://testca.pythontest.net/testca/ocsp/',),
     'caIssuers': ('http://testca.pythontest.net/testca/pycacert.cer',),
diff --git a/Lib/test/test_ftplib.py b/Lib/test/test_ftplib.py
index 544228e3bab..bebd1bbb9e2 100644
--- a/Lib/test/test_ftplib.py
+++ b/Lib/test/test_ftplib.py
@@ -325,8 +325,8 @@ class DummyFTPServer(asyncore.dispatcher, threading.Thread):
 
 if ssl is not None:
 
-    CERTFILE = os.path.join(os.path.dirname(__file__), "keycert3.pem")
-    CAFILE = os.path.join(os.path.dirname(__file__), "pycacert.pem")
+    CERTFILE = os.path.join(os.path.dirname(__file__), "certdata", "keycert3.pem")
+    CAFILE = os.path.join(os.path.dirname(__file__), "certdata", "pycacert.pem")
 
     class SSLConnection(asyncore.dispatcher):
         """An asyncore.dispatcher subclass supporting TLS/SSL."""
diff --git a/Lib/test/test_httplib.py b/Lib/test/test_httplib.py
index 676725c46ec..5d5832b62b2 100644
--- a/Lib/test/test_httplib.py
+++ b/Lib/test/test_httplib.py
@@ -21,11 +21,13 @@ support.requires_working_socket(module=True)
 
 here = os.path.dirname(__file__)
 # Self-signed cert file for 'localhost'
-CERT_localhost = os.path.join(here, 'keycert.pem')
+CERT_localhost = os.path.join(here, 'certdata', 'keycert.pem')
 # Self-signed cert file for 'fakehostname'
-CERT_fakehostname = os.path.join(here, 'keycert2.pem')
+CERT_fakehostname = os.path.join(here, 'certdata', 'keycert2.pem')
 # Self-signed cert file for self-signed.pythontest.net
-CERT_selfsigned_pythontestdotnet = os.path.join(here, 'selfsigned_pythontestdotnet.pem')
+CERT_selfsigned_pythontestdotnet = os.path.join(
+    here, 'certdata', 'selfsigned_pythontestdotnet.pem',
+)
 
 # constants for testing chunked encoding
 chunked_start = (
diff --git a/Lib/test/test_imaplib.py b/Lib/test/test_imaplib.py
index a1eaf2169fe..b97474acca3 100644
--- a/Lib/test/test_imaplib.py
+++ b/Lib/test/test_imaplib.py
@@ -23,8 +23,8 @@ except ImportError:
 
 support.requires_working_socket(module=True)
 
-CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "keycert3.pem")
-CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "pycacert.pem")
+CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "keycert3.pem")
+CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "pycacert.pem")
 
 
 class TestImaplib(unittest.TestCase):
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 2305e5162f9..375f65f9d16 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -2170,7 +2170,7 @@ class HTTPHandlerTest(BaseTest):
                     sslctx = None
                 else:
                     here = os.path.dirname(__file__)
-                    localhost_cert = os.path.join(here, "keycert.pem")
+                    localhost_cert = os.path.join(here, "certdata", "keycert.pem")
                     sslctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
                     sslctx.load_cert_chain(localhost_cert)
 
diff --git a/Lib/test/test_poplib.py b/Lib/test/test_poplib.py
index fa41ba0b6e4..869f9431b92 100644
--- a/Lib/test/test_poplib.py
+++ b/Lib/test/test_poplib.py
@@ -29,8 +29,8 @@ if hasattr(poplib, 'POP3_SSL'):
     import ssl
 
     SUPPORTS_SSL = True
-    CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "keycert3.pem")
-    CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "pycacert.pem")
+    CERTFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "keycert3.pem")
+    CAFILE = os.path.join(os.path.dirname(__file__) or os.curdir, "certdata", "pycacert.pem")
 
 requires_ssl = skipUnless(SUPPORTS_SSL, 'SSL not supported')
 
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 2c32fec5104..06304dcb4ec 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -60,10 +60,10 @@ for proto, ver in (
     PROTOCOL_TO_TLS_VERSION[proto] = ver
 
 def data_file(*name):
-    return os.path.join(os.path.dirname(__file__), *name)
+    return os.path.join(os.path.dirname(__file__), "certdata", *name)
 
 # The custom key and certificate files used in test_ssl are generated
-# using Lib/test/make_ssl_certs.py.
+# using Lib/test/certdata/make_ssl_certs.py.
 # Other certificates are simply fetched from the internet servers they
 # are meant to authenticate.
 
@@ -641,7 +641,7 @@ class BasicSocketTests(unittest.TestCase):
     def bad_cert_test(self, certfile):
         """Check that trying to use the given client certificate fails"""
         certfile = os.path.join(os.path.dirname(__file__) or os.curdir,
-                                   certfile)
+                                "certdata", certfile)
         sock = socket.socket()
         self.addCleanup(sock.close)
         with self.assertRaises(ssl.SSLError):
@@ -3309,12 +3309,12 @@ class ThreadedTests(unittest.TestCase):
         # try to connect
         if support.verbose:
             sys.stdout.write('\n')
-        with open(CERTFILE, 'rb') as f:
+        # Get this test file itself:
+        with open(__file__, 'rb') as f:
             d1 = f.read()
         d2 = ''
         # now fetch the same data from the HTTPS server
-        url = 'https://localhost:%d/%s' % (
-            server.port, os.path.split(CERTFILE)[1])
+        url = f'https://localhost:{server.port}/test_ssl.py'
         context = ssl.create_default_context(cafile=SIGNING_CA)
         f = urllib.request.urlopen(url, context=context)
         try:
diff --git a/Lib/test/test_urllib2_localnet.py b/Lib/test/test_urllib2_localnet.py
index 0dcdbac76b5..50c491a3cfd 100644
--- a/Lib/test/test_urllib2_localnet.py
+++ b/Lib/test/test_urllib2_localnet.py
@@ -21,9 +21,9 @@ support.requires_working_socket(module=True)
 
 here = os.path.dirname(__file__)
 # Self-signed cert file for 'localhost'
-CERT_localhost = os.path.join(here, 'keycert.pem')
+CERT_localhost = os.path.join(here, 'certdata', 'keycert.pem')
 # Self-signed cert file for 'fakehostname'
-CERT_fakehostname = os.path.join(here, 'keycert2.pem')
+CERT_fakehostname = os.path.join(here, 'certdata', 'keycert2.pem')
 
 
 # Loopback http server infrastructure
diff --git a/Makefile.pre.in b/Makefile.pre.in
index ba35e1b563c..35f25450857 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2141,7 +2141,8 @@ LIBSUBDIRS=	asyncio \
 TESTSUBDIRS=	idlelib/idle_test \
 		test \
 		test/audiodata \
-		test/capath \
+		test/certdata \
+		test/certdata/capath \
 		test/cjkencodings \
 		test/crashers \
 		test/data \