diff --git a/os_brick/encryptors/__init__.py b/os_brick/encryptors/__init__.py
index 92aca1b03..064fbd50f 100644
--- a/os_brick/encryptors/__init__.py
+++ b/os_brick/encryptors/__init__.py
@@ -22,6 +22,23 @@ from oslo_utils import strutils
 
 LOG = logging.getLogger(__name__)
 
+LUKS = "luks"
+PLAIN = "plain"
+
+FORMAT_TO_FRONTEND_ENCRYPTOR_MAP = {
+    LUKS: 'os_brick.encryptors.luks.LuksEncryptor',
+    PLAIN: 'os_brick.encryptors.cryptsetup.CryptsetupEncryptor'
+}
+
+LEGACY_PROVIDER_CLASS_TO_FORMAT_MAP = {
+    "os_brick.encryptors.luks.LuksEncryptor": LUKS,
+    "os_brick.encryptors.cryptsetup.CryptsetupEncryptor": PLAIN,
+    "os_brick.encryptors.nop.NoopEncryptor": None,
+    "LuksEncryptor": LUKS,
+    "CryptsetupEncryptor": PLAIN,
+    "NoOpEncryptor": None,
+}
+
 
 def get_volume_encryptor(root_helper,
                          connection_info,
@@ -43,14 +60,24 @@ def get_volume_encryptor(root_helper,
     if location and location.lower() == 'front-end':  # case insensitive
         provider = kwargs.get('provider')
 
-        if provider == 'LuksEncryptor' or 'LuksEncryptor' in provider:
-            provider = 'os_brick.encryptors.luks.LuksEncryptor'
-        elif (provider == 'CryptsetupEncryptor' or
-              'CryptsetupEncryptor' in provider):
-            provider = \
-                'os_brick.encryptors.cryptsetup.CryptsetupEncryptor'
-        elif (provider == 'NoOpEncryptor' or 'NoOpEncryptor' in provider):
-            provider = 'os_brick.encryptors.nop.NoOpEncryptor'
+        # TODO(lyarwood): Remove the following in Pike and raise an
+        # ERROR if provider is not a key in SUPPORTED_ENCRYPTION_PROVIDERS.
+        # Until then continue to allow both the class name and path to be used.
+        if provider in LEGACY_PROVIDER_CLASS_TO_FORMAT_MAP:
+            LOG.warning(_LW("Use of the in tree encryptor class %(provider)s"
+                            " by directly referencing the implementation class"
+                            " will be blocked in the Pike release of"
+                            " os-brick."), {'provider': provider})
+            provider = LEGACY_PROVIDER_CLASS_TO_FORMAT_MAP[provider]
+
+        if provider in FORMAT_TO_FRONTEND_ENCRYPTOR_MAP:
+            provider = FORMAT_TO_FRONTEND_ENCRYPTOR_MAP[provider]
+        elif provider is None:
+            provider = "os_brick.encryptors.nop.NoOpEncryptor"
+        else:
+            LOG.warning(_LW("Use of the out of tree encryptor class "
+                            "%(provider)s will be blocked with the Pike "
+                            "release of os-brick."), {'provider': provider})
 
         try:
             encryptor = importutils.import_object(
diff --git a/os_brick/tests/encryptors/test_base.py b/os_brick/tests/encryptors/test_base.py
index b9d8d19ed..8609cb9f7 100644
--- a/os_brick/tests/encryptors/test_base.py
+++ b/os_brick/tests/encryptors/test_base.py
@@ -40,44 +40,42 @@ class VolumeEncryptorTestCase(base.TestCase):
 
 class BaseEncryptorTestCase(VolumeEncryptorTestCase):
 
+    def _test_get_encryptor(self, provider, expected_provider_class):
+        encryption = {'control_location': 'front-end',
+                      'provider': provider}
+        encryptor = encryptors.get_volume_encryptor(
+            root_helper=self.root_helper,
+            connection_info=self.connection_info,
+            keymgr=self.keymgr,
+            **encryption)
+        self.assertIsInstance(encryptor, expected_provider_class)
+
     def test_get_encryptors(self):
 
-        encryption = {'control_location': 'front-end',
-                      'provider': 'LuksEncryptor'}
-        encryptor = encryptors.get_volume_encryptor(
-            root_helper=self.root_helper,
-            connection_info=self.connection_info,
-            keymgr=self.keymgr,
-            **encryption)
+        self._test_get_encryptor('luks',
+                                 encryptors.luks.LuksEncryptor)
+        # TODO(lyarwood): Remove the following in Pike
+        self._test_get_encryptor('LuksEncryptor',
+                                 encryptors.luks.LuksEncryptor)
+        self._test_get_encryptor('os_brick.encryptors.luks.LuksEncryptor',
+                                 encryptors.luks.LuksEncryptor)
 
-        self.assertIsInstance(encryptor,
-                              encryptors.luks.LuksEncryptor,
-                              "encryptor is not an instance of LuksEncryptor")
+        self._test_get_encryptor('plain',
+                                 encryptors.cryptsetup.CryptsetupEncryptor)
+        # TODO(lyarwood): Remove the following in Pike
+        self._test_get_encryptor('CryptsetupEncryptor',
+                                 encryptors.cryptsetup.CryptsetupEncryptor)
+        self._test_get_encryptor(
+            'os_brick.encryptors.cryptsetup.CryptsetupEncryptor',
+            encryptors.cryptsetup.CryptsetupEncryptor)
 
-        encryption = {'control_location': 'front-end',
-                      'provider': 'CryptsetupEncryptor'}
-        encryptor = encryptors.get_volume_encryptor(
-            root_helper=self.root_helper,
-            connection_info=self.connection_info,
-            keymgr=self.keymgr,
-            **encryption)
-
-        self.assertIsInstance(encryptor,
-                              encryptors.cryptsetup.CryptsetupEncryptor,
-                              "encryptor is not an instance of"
-                              "CryptsetupEncryptor")
-
-        encryption = {'control_location': 'front-end',
-                      'provider': 'NoOpEncryptor'}
-        encryptor = encryptors.get_volume_encryptor(
-            root_helper=self.root_helper,
-            connection_info=self.connection_info,
-            keymgr=self.keymgr,
-            **encryption)
-
-        self.assertIsInstance(encryptor,
-                              encryptors.nop.NoOpEncryptor,
-                              "encryptor is not an instance of NoOpEncryptor")
+        self._test_get_encryptor(None,
+                                 encryptors.nop.NoOpEncryptor)
+        # TODO(lyarwood): Remove the following in Pike
+        self._test_get_encryptor('NoOpEncryptor',
+                                 encryptors.nop.NoOpEncryptor)
+        self._test_get_encryptor('os_brick.encryptors.nop.NoOpEncryptor',
+                                 encryptors.nop.NoOpEncryptor)
 
     def test_get_error_encryptors(self):
         encryption = {'control_location': 'front-end',
@@ -106,3 +104,55 @@ class BaseEncryptorTestCase(VolumeEncryptorTestCase):
                                               "%(exception)s",
                                               {'provider': provider,
                                                'exception': e})
+
+    @mock.patch('os_brick.encryptors.LOG')
+    def test_get_missing_out_of_tree_encryptor_log(self, log):
+        provider = 'TestEncryptor'
+        encryption = {'control_location': 'front-end',
+                      'provider': provider}
+        try:
+            encryptors.get_volume_encryptor(
+                root_helper=self.root_helper,
+                connection_info=self.connection_info,
+                keymgr=self.keymgr,
+                **encryption)
+        except Exception as e:
+            log.error.assert_called_once_with("Error instantiating "
+                                              "%(provider)s: "
+                                              "%(exception)s",
+                                              {'provider': provider,
+                                               'exception': e})
+            log.warning.assert_called_once_with("Use of the out of tree "
+                                                "encryptor class %(provider)s "
+                                                "will be blocked with the "
+                                                "Pike release of os-brick.",
+                                                {'provider': provider})
+
+    @mock.patch('os_brick.encryptors.LOG')
+    def test_get_direct_encryptor_log(self, log):
+        encryption = {'control_location': 'front-end',
+                      'provider': 'LuksEncryptor'}
+        encryptors.get_volume_encryptor(
+            root_helper=self.root_helper,
+            connection_info=self.connection_info,
+            keymgr=self.keymgr,
+            **encryption)
+
+        encryption = {'control_location': 'front-end',
+                      'provider': 'os_brick.encryptors.luks.LuksEncryptor'}
+        encryptors.get_volume_encryptor(
+            root_helper=self.root_helper,
+            connection_info=self.connection_info,
+            keymgr=self.keymgr,
+            **encryption)
+
+        log.warning.assert_has_calls([
+            mock.call("Use of the in tree encryptor class %(provider)s by "
+                      "directly referencing the implementation class will be "
+                      "blocked in the Pike release of os-brick.",
+                      {'provider': 'LuksEncryptor'}),
+            mock.call("Use of the in tree encryptor class %(provider)s by "
+                      "directly referencing the implementation class will be "
+                      "blocked in the Pike release of os-brick.",
+                      {'provider':
+                       'os_brick.encryptors.luks.LuksEncryptor'})])
diff --git a/releasenotes/notes/introduce-encryption-provider-constants-a7cd0ce58da2bae8.yaml b/releasenotes/notes/introduce-encryption-provider-constants-a7cd0ce58da2bae8.yaml
new file mode 100644
index 000000000..ec9fe21d1
--- /dev/null
+++ b/releasenotes/notes/introduce-encryption-provider-constants-a7cd0ce58da2bae8.yaml
@@ -0,0 +1,14 @@
+---
+features:
+  - |
+    Encryption provider constants have been introduced detailing the supported
+    encryption formats such as LUKs along with their associated in-tree
+    provider implementations. These constants should now be used to identify an
+    encryption provider implementation for a given encryption format.
+deprecations:
+  - |
+    The direct use of the encryption provider classes such as
+    os_brick.encryptors.luks.LuksEncryptor is now deprecated and will be
+    blocked in the Pike release of os-brick. The use of out of tree encryption
+    provider classes is also deprecated and will be blocked in the Pike release
+    of os-brick.