diff --git a/src/sagemaker/lineage/query.py b/src/sagemaker/lineage/query.py
index 033e838137..78cfc700e6 100644
--- a/src/sagemaker/lineage/query.py
+++ b/src/sagemaker/lineage/query.py
@@ -12,9 +12,11 @@
 # language governing permissions and limitations under the License.
 """This module contains code to query SageMaker lineage."""
 from __future__ import absolute_import
+
 from datetime import datetime
 from enum import Enum
 from typing import Optional, Union, List, Dict
+
 from sagemaker.lineage._utils import get_resource_name_from_arn
 
 
@@ -65,6 +67,27 @@ def __init__(
         self.destination_arn = destination_arn
         self.association_type = association_type
 
+    def __hash__(self):
+        """Define hash function for ``Edge``."""
+        return hash(
+            (
+                "source_arn",
+                self.source_arn,
+                "destination_arn",
+                self.destination_arn,
+                "association_type",
+                self.association_type,
+            )
+        )
+
+    def __eq__(self, other):
+        """Define equal function for ``Edge``."""
+        return (
+            self.association_type == other.association_type
+            and self.source_arn == other.source_arn
+            and self.destination_arn == other.destination_arn
+        )
+
 
 class Vertex:
     """A vertex for a lineage graph."""
@@ -82,6 +105,27 @@ def __init__(
         self.lineage_source = lineage_source
         self._session = sagemaker_session
 
+    def __hash__(self):
+        """Define hash function for ``Vertex``."""
+        return hash(
+            (
+                "arn",
+                self.arn,
+                "lineage_entity",
+                self.lineage_entity,
+                "lineage_source",
+                self.lineage_source,
+            )
+        )
+
+    def __eq__(self, other):
+        """Define equal function for ``Vertex``."""
+        return (
+            self.arn == other.arn
+            and self.lineage_entity == other.lineage_entity
+            and self.lineage_source == other.lineage_source
+        )
+
     def to_lineage_object(self):
         """Convert the ``Vertex`` object to its corresponding Artifact, Action, Context object."""
         from sagemaker.lineage.artifact import Artifact, ModelArtifact
@@ -210,6 +254,18 @@ def _convert_api_response(self, response) -> LineageQueryResult:
         converted.edges = [self._get_edge(edge) for edge in response["Edges"]]
         converted.vertices = [self._get_vertex(vertex) for vertex in response["Vertices"]]
 
+        edge_set = set()
+        for edge in converted.edges:
+            if edge in edge_set:
+                converted.edges.remove(edge)
+            edge_set.add(edge)
+
+        vertex_set = set()
+        for vertex in converted.vertices:
+            if vertex in vertex_set:
+                converted.vertices.remove(vertex)
+            vertex_set.add(vertex)
+
         return converted
 
     def _collapse_cross_account_artifacts(self, query_response):
diff --git a/tests/unit/sagemaker/lineage/test_query.py b/tests/unit/sagemaker/lineage/test_query.py
index 595e7e1d0f..50bb14e6b1 100644
--- a/tests/unit/sagemaker/lineage/test_query.py
+++ b/tests/unit/sagemaker/lineage/test_query.py
@@ -32,6 +32,38 @@ def test_lineage_query(sagemaker_session):
         start_arns=["arn:aws:sagemaker:us-west-2:0123456789012:context/mycontext"]
     )
 
+    assert len(response.edges) == 1
+    assert response.edges[0].source_arn == "arn1"
+    assert response.edges[0].destination_arn == "arn2"
+    assert response.edges[0].association_type == "Produced"
+    assert len(response.vertices) == 2
+
+    assert response.vertices[0].arn == "arn1"
+    assert response.vertices[0].lineage_source == "Endpoint"
+    assert response.vertices[0].lineage_entity == "Artifact"
+    assert response.vertices[1].arn == "arn2"
+    assert response.vertices[1].lineage_source == "Model"
+    assert response.vertices[1].lineage_entity == "Context"
+
+
+def test_lineage_query_duplication(sagemaker_session):
+    lineage_query = LineageQuery(sagemaker_session)
+    sagemaker_session.sagemaker_client.query_lineage.return_value = {
+        "Vertices": [
+            {"Arn": "arn1", "Type": "Endpoint", "LineageType": "Artifact"},
+            {"Arn": "arn1", "Type": "Endpoint", "LineageType": "Artifact"},
+            {"Arn": "arn2", "Type": "Model", "LineageType": "Context"},
+        ],
+        "Edges": [
+            {"SourceArn": "arn1", "DestinationArn": "arn2", "AssociationType": "Produced"},
+            {"SourceArn": "arn1", "DestinationArn": "arn2", "AssociationType": "Produced"},
+        ],
+    }
+
+    response = lineage_query.query(
+        start_arns=["arn:aws:sagemaker:us-west-2:0123456789012:context/mycontext"]
+    )
+
     assert len(response.edges) == 1
     assert response.edges[0].source_arn == "arn1"
     assert response.edges[0].destination_arn == "arn2"