diff --git a/docs/README.md b/docs/README.md
index 569d0b5f7c..2212dc6939 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -156,23 +156,23 @@ nupic
 │   ├── stats.py [TODO]
 │   └── topology.py [TODO]
 ├── regions
-│   ├── AnomalyLikelihoodRegion.py [OK]
-│   ├── AnomalyRegion.py [OK]
-│   ├── CLAClassifierRegion.py [TODO]
-│   ├── KNNAnomalyClassifierRegion.py [TODO]
-│   ├── KNNClassifierRegion.py [TODO]
-│   ├── PluggableEncoderSensor.py [TODO]
-│   ├── RecordSensor.py [TODO]
-│   ├── RecordSensorFilters
+│   ├── anomaly_likelihood_region.py [OK]
+│   ├── anomaly_region.py [OK]
+│   ├── cla_classifier_region.py [TODO]
+│   ├── knn_anomaly_classifier_region.py [TODO]
+│   ├── knn_classifier_region.py [TODO]
+│   ├── pluggable_encoder_sensor.py [TODO]
+│   ├── record_sensor.py [TODO]
+│   ├── record_sensor_filters
 │   │   ├── add_noise.py [TODO]
 │   │   └── modify_fields.py [TODO]
-│   ├── SDRClassifierRegion.py [TODO]
-│   ├── SPRegion.py [TODO]
-│   ├── SVMClassifierNode.py [TODO]
-│   ├── Spec.py [TODO]
-│   ├── TMRegion.py [TODO]
-│   ├── TestRegion.py [TODO]
-│   └─── UnimportableNode.py [TODO]
+│   ├── sdr_classifier_region.py [TODO]
+│   ├── sp_region.py [TODO]
+│   ├── svm_classifier_node.py [TODO]
+│   ├── spec.py [TODO]
+│   ├── tm_region.py [TODO]
+│   ├── test_region.py [TODO]
+│   └─── unimportable_node.py [TODO]
 ├── serializable.py [TODO]
 ├── simple_server.py [TODO]
 ├── support
diff --git a/docs/source/api/network/regions.rst b/docs/source/api/network/regions.rst
index 64876e3928..5772d5c4f7 100644
--- a/docs/source/api/network/regions.rst
+++ b/docs/source/api/network/regions.rst
@@ -12,42 +12,42 @@ PyRegion
 AnomalyRegion
 ^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.AnomalyRegion.AnomalyRegion
+.. autoclass:: nupic.regions.anomaly_region.AnomalyRegion
    :members:
    :show-inheritance:
 
 SPRegion
 ^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.SPRegion.SPRegion
+.. autoclass:: nupic.regions.sp_region.SPRegion
    :members:
    :show-inheritance:
 
 TMRegion
 ^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.TMRegion.TMRegion
+.. autoclass:: nupic.regions.tm_region.TMRegion
    :members:
    :show-inheritance:
 
 AnomalyLikelihoodRegion
 ^^^^^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.AnomalyLikelihoodRegion.AnomalyLikelihoodRegion
+.. autoclass:: nupic.regions.anomaly_likelihood_region.AnomalyLikelihoodRegion
    :members:
    :show-inheritance:
 
 CLAClassifierRegion
 ^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.CLAClassifierRegion.CLAClassifierRegion
+.. autoclass:: nupic.regions.cla_classifier_region.CLAClassifierRegion
    :members:
    :show-inheritance:
 
 KNNAnomalyClassifierRegion
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.KNNAnomalyClassifierRegion.KNNAnomalyClassifierRegion
+.. autoclass:: nupic.regions.knn_anomaly_classifier_region.KNNAnomalyClassifierRegion
    :members:
    :show-inheritance:
 
@@ -55,7 +55,7 @@ KNNAnomalyClassifierRegion
 KNNClassifierRegion
 ^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.KNNClassifierRegion.KNNClassifierRegion
+.. autoclass:: nupic.regions.knn_classifier_region.KNNClassifierRegion
    :members:
    :show-inheritance:
 
@@ -63,6 +63,6 @@ KNNClassifierRegion
 SDRClassifierRegion
 ^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.SDRClassifierRegion.SDRClassifierRegion
+.. autoclass:: nupic.regions.sdr_classifier_region.SDRClassifierRegion
    :members:
    :show-inheritance:
diff --git a/docs/source/api/network/sensors.rst b/docs/source/api/network/sensors.rst
index 471dccab3c..7cd2f18217 100644
--- a/docs/source/api/network/sensors.rst
+++ b/docs/source/api/network/sensors.rst
@@ -4,7 +4,7 @@ Sensors
 PluggableEncoderSensor
 ^^^^^^^^^^^^^^^^^^^^^^
 
-.. autoclass:: nupic.regions.PluggableEncoderSensor.PluggableEncoderSensor
+.. autoclass:: nupic.regions.pluggable_encoder_sensor.PluggableEncoderSensor
    :members:
    :show-inheritance:
 
diff --git a/docs/source/quick-start/network.rst b/docs/source/quick-start/network.rst
index b444cc2a12..953d22b79d 100644
--- a/docs/source/quick-start/network.rst
+++ b/docs/source/quick-start/network.rst
@@ -194,7 +194,7 @@ classifier region. In our case, we are interested in:
     probabilities = classifierRegion.getOutputData("probabilities")
 
 
-Refer to the documentation of :class:`~nupic.regions.SDRClassifierRegion.SDRClassifierRegion` for
+Refer to the documentation of :class:`~nupic.regions.sdr_classifier_region.SDRClassifierRegion` for
 more information about output values and their structure.
 
 We'll use the helper function below to extract predictions more easily from
diff --git a/examples/network/network_api_demo.py b/examples/network/network_api_demo.py
index 3972e9ac6e..313caf44f0 100755
--- a/examples/network/network_api_demo.py
+++ b/examples/network/network_api_demo.py
@@ -29,8 +29,8 @@
 from nupic.data.file_record_stream import FileRecordStream
 from nupic.engine import Network
 from nupic.encoders import MultiEncoder, ScalarEncoder, DateEncoder
-from nupic.regions.SPRegion import SPRegion
-from nupic.regions.TMRegion import TMRegion
+from nupic.regions.sp_region import SPRegion
+from nupic.regions.tm_region import TMRegion
 
 _VERBOSITY = 0  # how chatty the demo should be
 _SEED = 1956  # the random seed used throughout
diff --git a/examples/prediction/experiments/dutyCycle/base/description.py b/examples/prediction/experiments/dutyCycle/base/description.py
index 6b7dc2dbe8..cd86bff031 100644
--- a/examples/prediction/experiments/dutyCycle/base/description.py
+++ b/examples/prediction/experiments/dutyCycle/base/description.py
@@ -35,7 +35,7 @@
                                                    displaySPCoincidences,
                                                    setAttribute,
                                                    sensorOpen)
-from nupic.regions.RecordSensorFilters.modify_fields import ModifyFields
+from nupic.regions.record_sensor_filters.modify_fields import ModifyFields
 
 
 
diff --git a/src/nupic/data/stats.py b/src/nupic/data/stats.py
index b1f42ae5ed..952c9dd598 100644
--- a/src/nupic/data/stats.py
+++ b/src/nupic/data/stats.py
@@ -24,7 +24,7 @@
 
 from pkg_resources import resource_filename
 
-from nupic.regions.RecordSensor import RecordSensor
+from nupic.regions.record_sensor import RecordSensor
 from nupic.data.file_record_stream import FileRecordStream
 
 
diff --git a/src/nupic/engine/__init__.py b/src/nupic/engine/__init__.py
index ffe49e54c6..2020a9cbb4 100644
--- a/src/nupic/engine/__init__.py
+++ b/src/nupic/engine/__init__.py
@@ -43,19 +43,19 @@
 pyRegions = (
     ("nupic.bindings.regions.TestNode", "TestNode"),
     ("nupic.regions.AnomalyLikelihoodRegion", "AnomalyLikelihoodRegion"),
-    ("nupic.regions.AnomalyRegion", "AnomalyRegion"),
-    ("nupic.regions.CLAClassifierRegion", "CLAClassifierRegion"),
-    ("nupic.regions.KNNAnomalyClassifierRegion", "KNNAnomalyClassifierRegion"),
-    ("nupic.regions.KNNClassifierRegion", "KNNClassifierRegion"),
-    ("nupic.regions.PluggableEncoderSensor", "PluggableEncoderSensor"),
+    ("nupic.regions.anomaly_region", "AnomalyRegion"),
+    ("nupic.regions.cla_classifier_region", "CLAClassifierRegion"),
+    ("nupic.regions.knn_anomaly_classifier_region", "KNNAnomalyClassifierRegion"),
+    ("nupic.regions.knn_classifier_region", "KNNClassifierRegion"),
+    ("nupic.regions.pluggable_encoder_sensor", "PluggableEncoderSensor"),
     ("nupic.regions.PyRegion", "PyRegion"),
-    ("nupic.regions.RecordSensor", "RecordSensor"),
-    ("nupic.regions.SDRClassifierRegion", "SDRClassifierRegion"),
-    ("nupic.regions.SPRegion", "SPRegion"),
-    ("nupic.regions.SVMClassifierNode", "SVMClassifierNode"),
-    ("nupic.regions.TestRegion", "TestRegion"),
-    ("nupic.regions.TMRegion", "TMRegion"),
-    ("nupic.regions.UnimportableNode", "UnimportableNode"),
+    ("nupic.regions.record_sensor", "RecordSensor"),
+    ("nupic.regions.sdr_classifier_region", "SDRClassifierRegion"),
+    ("nupic.regions.sp_region", "SPRegion"),
+    ("nupic.regions.svm_classifier_node", "SVMClassifierNode"),
+    ("nupic.regions.test_region", "TestRegion"),
+    ("nupic.regions.tm_region", "TMRegion"),
+    ("nupic.regions.unimportable_node", "UnimportableNode"),
 )
 
 registeredRegions = False
@@ -727,7 +727,7 @@ def save(self, *args, **kwargs):
   def getRegionsByType(self, regionClass):
     """
     Gets all region instances of a given class
-    (for example, nupic.regions.SPRegion.SPRegion).
+    (for example, nupic.regions.sp_region.SPRegion).
     """
     regions = []
 
diff --git a/src/nupic/regions/AnomalyRegion.py b/src/nupic/regions/anomaly_region.py
similarity index 100%
rename from src/nupic/regions/AnomalyRegion.py
rename to src/nupic/regions/anomaly_region.py
diff --git a/src/nupic/regions/CLAClassifierRegion.py b/src/nupic/regions/cla_classifier_region.py
similarity index 100%
rename from src/nupic/regions/CLAClassifierRegion.py
rename to src/nupic/regions/cla_classifier_region.py
diff --git a/src/nupic/regions/KNNAnomalyClassifierRegion.py b/src/nupic/regions/knn_anomaly_classifier_region.py
similarity index 99%
rename from src/nupic/regions/KNNAnomalyClassifierRegion.py
rename to src/nupic/regions/knn_anomaly_classifier_region.py
index 9ce73618b7..a9c3e3c709 100644
--- a/src/nupic/regions/KNNAnomalyClassifierRegion.py
+++ b/src/nupic/regions/knn_anomaly_classifier_region.py
@@ -29,7 +29,7 @@
 
 from nupic.algorithms import anomaly
 from nupic.bindings.regions.PyRegion import PyRegion
-from KNNClassifierRegion import KNNClassifierRegion
+from knn_classifier_region import KNNClassifierRegion
 from nupic.bindings.math import Random
 from nupic.frameworks.opf.exceptions import (HTMPredictionModelInvalidRangeError,
                                              HTMPredictionModelInvalidArgument)
diff --git a/src/nupic/regions/KNNClassifierRegion.py b/src/nupic/regions/knn_classifier_region.py
similarity index 100%
rename from src/nupic/regions/KNNClassifierRegion.py
rename to src/nupic/regions/knn_classifier_region.py
diff --git a/src/nupic/regions/PluggableEncoderSensor.py b/src/nupic/regions/pluggable_encoder_sensor.py
similarity index 100%
rename from src/nupic/regions/PluggableEncoderSensor.py
rename to src/nupic/regions/pluggable_encoder_sensor.py
diff --git a/src/nupic/regions/RecordSensor.py b/src/nupic/regions/record_sensor.py
similarity index 100%
rename from src/nupic/regions/RecordSensor.py
rename to src/nupic/regions/record_sensor.py
diff --git a/src/nupic/regions/RecordSensorFilters/__init__.py b/src/nupic/regions/record_sensor_filters/__init__.py
similarity index 100%
rename from src/nupic/regions/RecordSensorFilters/__init__.py
rename to src/nupic/regions/record_sensor_filters/__init__.py
diff --git a/src/nupic/regions/RecordSensorFilters/add_noise.py b/src/nupic/regions/record_sensor_filters/add_noise.py
similarity index 100%
rename from src/nupic/regions/RecordSensorFilters/add_noise.py
rename to src/nupic/regions/record_sensor_filters/add_noise.py
diff --git a/src/nupic/regions/RecordSensorFilters/modify_fields.py b/src/nupic/regions/record_sensor_filters/modify_fields.py
similarity index 100%
rename from src/nupic/regions/RecordSensorFilters/modify_fields.py
rename to src/nupic/regions/record_sensor_filters/modify_fields.py
diff --git a/src/nupic/regions/SDRClassifierRegion.py b/src/nupic/regions/sdr_classifier_region.py
similarity index 100%
rename from src/nupic/regions/SDRClassifierRegion.py
rename to src/nupic/regions/sdr_classifier_region.py
diff --git a/src/nupic/regions/SPRegion.py b/src/nupic/regions/sp_region.py
similarity index 100%
rename from src/nupic/regions/SPRegion.py
rename to src/nupic/regions/sp_region.py
diff --git a/src/nupic/regions/Spec.py b/src/nupic/regions/spec.py
similarity index 100%
rename from src/nupic/regions/Spec.py
rename to src/nupic/regions/spec.py
diff --git a/src/nupic/regions/SVMClassifierNode.py b/src/nupic/regions/svm_classifier_node.py
similarity index 100%
rename from src/nupic/regions/SVMClassifierNode.py
rename to src/nupic/regions/svm_classifier_node.py
diff --git a/src/nupic/regions/TestRegion.py b/src/nupic/regions/test_region.py
similarity index 100%
rename from src/nupic/regions/TestRegion.py
rename to src/nupic/regions/test_region.py
diff --git a/src/nupic/regions/TMRegion.py b/src/nupic/regions/tm_region.py
similarity index 100%
rename from src/nupic/regions/TMRegion.py
rename to src/nupic/regions/tm_region.py
diff --git a/src/nupic/regions/UnimportableNode.py b/src/nupic/regions/unimportable_node.py
similarity index 100%
rename from src/nupic/regions/UnimportableNode.py
rename to src/nupic/regions/unimportable_node.py
diff --git a/tests/integration/nupic/engine/network_checkpoint_test.py b/tests/integration/nupic/engine/network_checkpoint_test.py
index 86a342f84e..16602894d2 100755
--- a/tests/integration/nupic/engine/network_checkpoint_test.py
+++ b/tests/integration/nupic/engine/network_checkpoint_test.py
@@ -22,8 +22,8 @@
 import unittest
 import numpy
 
-from nupic.regions.SPRegion import SPRegion
-from nupic.regions.RecordSensor import RecordSensor
+from nupic.regions.sp_region import SPRegion
+from nupic.regions.record_sensor import RecordSensor
 
 from network_creation_common import createAndRunNetwork
 
diff --git a/tests/integration/nupic/engine/network_creation_common.py b/tests/integration/nupic/engine/network_creation_common.py
index ee8d9cb20f..fa24b6d4fd 100755
--- a/tests/integration/nupic/engine/network_creation_common.py
+++ b/tests/integration/nupic/engine/network_creation_common.py
@@ -29,9 +29,9 @@
 from nupic.data.file_record_stream import FileRecordStream
 from nupic.engine import Network
 from nupic.encoders import MultiEncoder, ScalarEncoder, DateEncoder
-from nupic.regions.RecordSensor import RecordSensor
-from nupic.regions.SPRegion import SPRegion
-from nupic.regions.TMRegion import TMRegion
+from nupic.regions.record_sensor import RecordSensor
+from nupic.regions.sp_region import SPRegion
+from nupic.regions.tm_region import TMRegion
 
 try:
   import capnp
diff --git a/tests/integration/nupic/engine/temporal_memory_compatibility_test.py b/tests/integration/nupic/engine/temporal_memory_compatibility_test.py
index 43f7cd3bf2..742d7ad2f4 100755
--- a/tests/integration/nupic/engine/temporal_memory_compatibility_test.py
+++ b/tests/integration/nupic/engine/temporal_memory_compatibility_test.py
@@ -23,7 +23,7 @@
 import unittest
 import numpy
 
-from nupic.regions.TMRegion import TMRegion
+from nupic.regions.tm_region import TMRegion
 
 from network_creation_common import createAndRunNetwork
 
diff --git a/tests/integration/nupic/opf/opf_region_test.py b/tests/integration/nupic/opf/opf_region_test.py
index ffee694d80..653ae7d8b3 100755
--- a/tests/integration/nupic/opf/opf_region_test.py
+++ b/tests/integration/nupic/opf/opf_region_test.py
@@ -53,8 +53,8 @@
 from nupic.data.file_record_stream import FileRecordStream
 from nupic.encoders import MultiEncoder
 from nupic.engine import Network
-from nupic.regions.SPRegion import SPRegion
-from nupic.regions.TMRegion import TMRegion
+from nupic.regions.sp_region import SPRegion
+from nupic.regions.tm_region import TMRegion
 from nupic.support.unittesthelpers.testcasebase import TestCaseBase
 
 _VERBOSITY = 0         # how chatty the unit tests should be
diff --git a/tests/unit/nupic/data/filters_test.py b/tests/unit/nupic/data/filters_test.py
index d0d40dd1ad..01ca956589 100755
--- a/tests/unit/nupic/data/filters_test.py
+++ b/tests/unit/nupic/data/filters_test.py
@@ -30,7 +30,7 @@
 import unittest2 as unittest
 from pkg_resources import resource_filename
 
-from nupic.regions.RecordSensor import RecordSensor
+from nupic.regions.record_sensor import RecordSensor
 from nupic.data.file_record_stream import FileRecordStream
 from nupic.encoders import MultiEncoder
 from nupic.data.filters import DeltaFilter
diff --git a/tests/unit/nupic/engine/network_test.py b/tests/unit/nupic/engine/network_test.py
index b4b5b78ef4..6dde6575bd 100755
--- a/tests/unit/nupic/engine/network_test.py
+++ b/tests/unit/nupic/engine/network_test.py
@@ -25,7 +25,7 @@
 
 from nupic import engine
 from nupic.bindings.regions.TestNode import TestNode
-from nupic.regions.SPRegion import SPRegion
+from nupic.regions.sp_region import SPRegion
 
 
 
@@ -45,8 +45,8 @@ def testErrorHandling(self):
 
     orig_import = __import__
     def import_mock(name, *args):
-      if name == "nupic.regions.UnimportableNode":
-        raise SyntaxError("invalid syntax (UnimportableNode.py, line 5)")
+      if name == "nupic.regions.unimportable_node":
+        raise SyntaxError("invalid syntax (unimportable_node.py, line 5)")
 
       return orig_import(name, *args)
 
@@ -55,7 +55,7 @@ def import_mock(name, *args):
       with self.assertRaises(Exception) as cm:
         n.addRegion('r', 'py.UnimportableNode', '')
 
-      self.assertEqual(cm.exception.message, "invalid syntax (UnimportableNode.py, line 5)")
+      self.assertEqual(cm.exception.message, "invalid syntax (unimportable_node.py, line 5)")
 
     # Test failure in the __init__() method
     with self.assertRaises(Exception) as cm:
diff --git a/tests/unit/nupic/regions/anomaly_region_test.py b/tests/unit/nupic/regions/anomaly_region_test.py
index d6b51c10ad..eb1ff9fd43 100644
--- a/tests/unit/nupic/regions/anomaly_region_test.py
+++ b/tests/unit/nupic/regions/anomaly_region_test.py
@@ -24,7 +24,7 @@
 
 import numpy
 
-from nupic.regions.AnomalyRegion import AnomalyRegion
+from nupic.regions.anomaly_region import AnomalyRegion
 
 try:
   import capnp
diff --git a/tests/unit/nupic/regions/knn_anomaly_classifier_region_test.py b/tests/unit/nupic/regions/knn_anomaly_classifier_region_test.py
index 8221b9298a..0c5574e4ac 100755
--- a/tests/unit/nupic/regions/knn_anomaly_classifier_region_test.py
+++ b/tests/unit/nupic/regions/knn_anomaly_classifier_region_test.py
@@ -32,7 +32,7 @@
                                                         TestOptionParser)
 from nupic.frameworks.opf.opf_utils import InferenceType
 
-from nupic.regions.KNNAnomalyClassifierRegion import (
+from nupic.regions.knn_anomaly_classifier_region import (
     KNNAnomalyClassifierRegion,
     _CLAClassificationRecord)
 
diff --git a/tests/unit/nupic/regions/regions_spec_test.py b/tests/unit/nupic/regions/regions_spec_test.py
index a76cdc4795..a839b9c6a8 100755
--- a/tests/unit/nupic/regions/regions_spec_test.py
+++ b/tests/unit/nupic/regions/regions_spec_test.py
@@ -21,7 +21,7 @@
 
 import unittest2 as unittest
 
-from nupic.regions.Spec import (Spec,
+from nupic.regions.spec import (Spec,
                                 InputSpec,
                                 OutputSpec,
                                 ParameterSpec,