diff --git a/src/main/java/com/netflix/simianarmy/aws/janitor/crawler/InstanceJanitorCrawler.java b/src/main/java/com/netflix/simianarmy/aws/janitor/crawler/InstanceJanitorCrawler.java
index 508e2fd3..76e00ac3 100644
--- a/src/main/java/com/netflix/simianarmy/aws/janitor/crawler/InstanceJanitorCrawler.java
+++ b/src/main/java/com/netflix/simianarmy/aws/janitor/crawler/InstanceJanitorCrawler.java
@@ -45,6 +45,9 @@ public class InstanceJanitorCrawler extends AbstractAWSJanitorCrawler {
     /** The name representing the additional field name of ASG's name. */
     public static final String INSTANCE_FIELD_ASG_NAME = "ASG_NAME";
 
+    /** The name representing the additional field name of the OpsWork stack name. */
+    public static final String  INSTANCE_FIELD_OPSWORKS_STACK_NAME = "OPSWORKS_STACK_NAME";
+
     /** The Constant LOGGER. */
     private static final Logger LOGGER = LoggerFactory.getLogger(InstanceJanitorCrawler.class);
 
@@ -101,6 +104,11 @@ private List<Resource> getInstanceResources(String... instanceIds) {
                 instanceResource.setAdditionalField(INSTANCE_FIELD_ASG_NAME, asgName);
                 LOGGER.info(String.format("instance %s has a ASG tag name %s.", instanceResource.getId(), asgName));
             }
+            String opsworksStackName = getOpsWorksStackName(instanceResource);
+            if (opsworksStackName != null) {
+                instanceResource.setAdditionalField(INSTANCE_FIELD_OPSWORKS_STACK_NAME, opsworksStackName);
+                LOGGER.info(String.format("instance %s is part of an OpsWorks stack named %s.", instanceResource.getId(), opsworksStackName));
+            }
             if (instance.getState() != null) {
                 ((AWSResource) instanceResource).setAWSResourceState(instance.getState().getName());
             }
@@ -122,4 +130,8 @@ private String getAsgName(Resource instanceResource, Map<String, AutoScalingInst
         }
         return asgName;
     }
+
+    private String getOpsWorksStackName(Resource instanceResource) {
+        return instanceResource.getTag("opsworks:stack");
+    }
 }
diff --git a/src/main/java/com/netflix/simianarmy/aws/janitor/rule/instance/OrphanedInstanceRule.java b/src/main/java/com/netflix/simianarmy/aws/janitor/rule/instance/OrphanedInstanceRule.java
index fe43165b..cfa96bbe 100644
--- a/src/main/java/com/netflix/simianarmy/aws/janitor/rule/instance/OrphanedInstanceRule.java
+++ b/src/main/java/com/netflix/simianarmy/aws/janitor/rule/instance/OrphanedInstanceRule.java
@@ -42,6 +42,7 @@ public class OrphanedInstanceRule implements Rule {
     private static final Logger LOGGER = LoggerFactory.getLogger(OrphanedInstanceRule.class);
 
     private static final String TERMINATION_REASON = "No ASG is associated with this instance";
+    private static final String ASG_OR_OPSWORKS_TERMINATION_REASON = "No ASG or OpsWorks stack is associated with this instance";
 
     private final MonkeyCalendar calendar;
 
@@ -50,6 +51,8 @@ public class OrphanedInstanceRule implements Rule {
     private final int retentionDaysWithOwner;
 
     private final int retentionDaysWithoutOwner;
+    
+    private final boolean respectOpsWorksParentage;
 
     /**
      * Constructor for OrphanedInstanceRule.
@@ -64,9 +67,11 @@ public class OrphanedInstanceRule implements Rule {
      * @param retentionDaysWithoutOwner
      *            The number of days that the orphaned instance is retained before being terminated
      *            when the instance has no owner specified
+     * @param respectOpsWorksParentage
+     *            If true, don't consider members of an OpsWorks stack as orphans 
      */
     public OrphanedInstanceRule(MonkeyCalendar calendar,
-            int instanceAgeThreshold, int retentionDaysWithOwner, int retentionDaysWithoutOwner) {
+            int instanceAgeThreshold, int retentionDaysWithOwner, int retentionDaysWithoutOwner, boolean respectOpsWorksParentage) {
         Validate.notNull(calendar);
         Validate.isTrue(instanceAgeThreshold >= 0);
         Validate.isTrue(retentionDaysWithOwner >= 0);
@@ -75,6 +80,12 @@ public OrphanedInstanceRule(MonkeyCalendar calendar,
         this.instanceAgeThreshold = instanceAgeThreshold;
         this.retentionDaysWithOwner = retentionDaysWithOwner;
         this.retentionDaysWithoutOwner = retentionDaysWithoutOwner;
+        this.respectOpsWorksParentage = respectOpsWorksParentage;
+    }
+    
+    public OrphanedInstanceRule(MonkeyCalendar calendar,
+            int instanceAgeThreshold, int retentionDaysWithOwner, int retentionDaysWithoutOwner) {
+        this(calendar, instanceAgeThreshold, retentionDaysWithOwner, retentionDaysWithoutOwner, false);
     }
 
     @Override
@@ -92,7 +103,9 @@ public boolean isValid(Resource resource) {
         }
         AWSResource instanceResource = (AWSResource) resource;
         String asgName = instanceResource.getAdditionalField(InstanceJanitorCrawler.INSTANCE_FIELD_ASG_NAME);
-        if (StringUtils.isEmpty(asgName)) {
+        String opsworkStackName = instanceResource.getAdditionalField(InstanceJanitorCrawler.INSTANCE_FIELD_OPSWORKS_STACK_NAME);
+        // If there is no ASG AND it isn't an OpsWorks stack (or OpsWorks isn't respected as a parent), we have an orphan
+        if (StringUtils.isEmpty(asgName) && (!respectOpsWorksParentage || StringUtils.isEmpty(opsworkStackName))) {
             if (resource.getLaunchTime() == null) {
                 LOGGER.error(String.format("The instance %s has no launch time.", resource.getId()));
                 return true;
@@ -113,7 +126,7 @@ public boolean isValid(Resource resource) {
                     }
                     Date terminationTime = calendar.getBusinessDay(new Date(now.getMillis()), retentionDays);
                     resource.setExpectedTerminationTime(terminationTime);
-                    resource.setTerminationReason(TERMINATION_REASON);
+                    resource.setTerminationReason((respectOpsWorksParentage) ? ASG_OR_OPSWORKS_TERMINATION_REASON : TERMINATION_REASON);
                 }
                 return false;
             }
diff --git a/src/main/java/com/netflix/simianarmy/basic/janitor/BasicJanitorMonkeyContext.java b/src/main/java/com/netflix/simianarmy/basic/janitor/BasicJanitorMonkeyContext.java
index f0860a7c..dac30086 100644
--- a/src/main/java/com/netflix/simianarmy/basic/janitor/BasicJanitorMonkeyContext.java
+++ b/src/main/java/com/netflix/simianarmy/basic/janitor/BasicJanitorMonkeyContext.java
@@ -208,7 +208,10 @@ private InstanceJanitor getInstanceJanitor() {
                                     "simianarmy.janitor.rule.orphanedInstanceRule.retentionDaysWithOwner", 3),
                                     (int) configuration().getNumOrElse(
                                             "simianarmy.janitor.rule.orphanedInstanceRule.retentionDaysWithoutOwner",
-                                            8)));
+                                            8),
+                                    configuration().getBoolOrElse(
+                                            "simianarmy.janitor.rule.orphanedInstanceRule.opsworks.parentage",
+                                            false)));
         }
         JanitorCrawler instanceCrawler;
         if (configuration().getBoolOrElse("simianarmy.janitor.edda.enabled", false)) {
diff --git a/src/main/resources/janitor.properties b/src/main/resources/janitor.properties
index 3c5a08b2..d588338f 100644
--- a/src/main/resources/janitor.properties
+++ b/src/main/resources/janitor.properties
@@ -59,6 +59,8 @@ simianarmy.janitor.rule.orphanedInstanceRule.retentionDaysWithOwner = 3
 # The number of business days the instance is kept after a notification is sent for the termination
 # when the instance has no owner.
 simianarmy.janitor.rule.orphanedInstanceRule.retentionDaysWithoutOwner = 8
+# If true, don't consider members of an OpsWorks stack as orphans
+simianarmy.janitor.rule.orphanedInstanceRule.opsworks.parentage = false
 
 # The following properties are used by the Janitor rule for cleaning up volumes that have been
 # detached from instances for certain days.