diff --git a/moto/ec2/models/network_acls.py b/moto/ec2/models/network_acls.py
index a3d9de4ab..6ebf9a6f2 100644
--- a/moto/ec2/models/network_acls.py
+++ b/moto/ec2/models/network_acls.py
@@ -238,6 +238,8 @@ class NetworkAcl(TaggedEC2Resource):
             return [entry.rule_number for entry in self.network_acl_entries]
         elif filter_name == "entry.rule-action":
             return [entry.rule_action for entry in self.network_acl_entries]
+        elif filter_name == "entry.egress":
+            return [entry.egress for entry in self.network_acl_entries]
         elif filter_name == "owner-id":
             return self.owner_id
         else:
diff --git a/tests/test_ec2/test_network_acls.py b/tests/test_ec2/test_network_acls.py
index 63f707fd7..6f777bef3 100644
--- a/tests/test_ec2/test_network_acls.py
+++ b/tests/test_ec2/test_network_acls.py
@@ -385,6 +385,21 @@ def test_describe_network_acls():
     )
     resp4["NetworkAcls"].should.have.length_of(0)
 
+    # Ensure filtering by egress flag
+    resp4 = conn.describe_network_acls(
+        Filters=[{"Name": "entry.egress", "Values": ["false"]}]
+    )
+    [entry["NetworkAclId"] for entry in resp4["NetworkAcls"]].should.contain(
+        network_acl_id
+    )
+    # the ACL with network_acl_id contains no entries with Egress=True
+    resp4 = conn.describe_network_acls(
+        Filters=[{"Name": "entry.egress", "Values": ["true"]}]
+    )
+    [entry["NetworkAclId"] for entry in resp4["NetworkAcls"]].shouldnt.contain(
+        network_acl_id
+    )
+
     # Ensure filtering by rule action
     resp4 = conn.describe_network_acls(
         Filters=[