diff --git a/nova/exception.py b/nova/exception.py
index b0b69091240e..ef95cb3df808 100644
--- a/nova/exception.py
+++ b/nova/exception.py
@@ -659,7 +659,7 @@ class FloatingIpExists(NovaException):
 
 
 class FloatingIpNotFound(NotFound):
-    ec2_code = "UnsupportedOpperation"
+    ec2_code = "UnsupportedOperation"
     msg_fmt = _("Floating ip not found for id %(id)s.")
 
 
@@ -690,7 +690,7 @@ class NoMoreFloatingIps(FloatingIpNotFound):
 
 
 class FloatingIpAssociated(NovaException):
-    ec2_code = "UnsupportedOpperation"
+    ec2_code = "UnsupportedOperation"
     msg_fmt = _("Floating ip %(address)s is associated.")
 
 
@@ -703,12 +703,12 @@ class NoFloatingIpsDefined(NotFound):
 
 
 class NoFloatingIpInterface(NotFound):
-    ec2_code = "UnsupportedOpperation"
+    ec2_code = "UnsupportedOperation"
     msg_fmt = _("Interface %(interface)s not found.")
 
 
 class CannotDisassociateAutoAssignedFloatingIP(NovaException):
-    ec2_code = "UnsupportedOpperation"
+    ec2_code = "UnsupportedOperation"
     msg_fmt = _("Cannot disassociate auto assigned floating ip")
 
 
diff --git a/nova/filters.py b/nova/filters.py
index 04757ecec183..6e5fd6920fc2 100644
--- a/nova/filters.py
+++ b/nova/filters.py
@@ -35,7 +35,7 @@ class BaseFilter(object):
     def filter_all(self, filter_obj_list, filter_properties):
         """Yield objects that pass the filter.
 
-        Can be overriden in a subclass, if you need to base filtering
+        Can be overridden in a subclass, if you need to base filtering
         decisions on all objects.  Otherwise, one can just override
         _filter_one() to filter a single object.
         """
diff --git a/nova/weights.py b/nova/weights.py
index 7dca2e40dd3f..da5c93a7adbd 100644
--- a/nova/weights.py
+++ b/nova/weights.py
@@ -34,7 +34,7 @@ class BaseWeigher(object):
     """Base class for pluggable weighers."""
     def _weight_multiplier(self):
         """How weighted this weigher should be.  Normally this would
-        be overriden in a subclass based on a config value.
+        be overridden in a subclass based on a config value.
         """
         return 1.0