diff --git a/sky/clouds/utils/oci_utils.py b/sky/clouds/utils/oci_utils.py
index 581d4d72d3c..46d4454d866 100644
--- a/sky/clouds/utils/oci_utils.py
+++ b/sky/clouds/utils/oci_utils.py
@@ -10,6 +10,8 @@
    from ubuntu 20.04 to ubuntu 22.04, including:
    - GPU: skypilot:gpu-ubuntu-2004 -> skypilot:gpu-ubuntu-2204
    - CPU: skypilot:cpu-ubuntu-2004 -> skypilot:cpu-ubuntu-2204
+ - Hysun He (hysun.he@oracle.com) @ Jan.01, 2025: Support reuse existing
+   VCN for SkyServe.
 """
 import os
 
@@ -109,8 +111,15 @@ def get_compartment(cls, region):
             ('oci', region, 'compartment_ocid'), default_compartment_ocid)
         return compartment
 
+    @classmethod
+    def get_vcn_ocid(cls, region):
+        # Will reuse the regional VCN if specified.
+        vcn = skypilot_config.get_nested(('oci', region, 'vcn_ocid'), None)
+        return vcn
+
     @classmethod
     def get_vcn_subnet(cls, region):
+        # Will reuse the subnet if specified.
         vcn = skypilot_config.get_nested(('oci', region, 'vcn_subnet'), None)
         return vcn
 
diff --git a/sky/provision/oci/query_utils.py b/sky/provision/oci/query_utils.py
index 3037fcc2703..3f545aca4ba 100644
--- a/sky/provision/oci/query_utils.py
+++ b/sky/provision/oci/query_utils.py
@@ -7,6 +7,8 @@
    find_compartment: allow search subtree when find a compartment.
  - Hysun He (hysun.he@oracle.com) @ Nov.12, 2024: Add methods to
    Add/remove security rules: create_nsg_rules & remove_nsg
+ - Hysun He (hysun.he@oracle.com) @ Jan.01, 2025: Support reuse existing
+   VCN for SkyServe.
 """
 from datetime import datetime
 import functools
@@ -17,7 +19,6 @@
 import typing
 from typing import List, Optional, Tuple
 
-from sky import exceptions
 from sky import sky_logging
 from sky.adaptors import common as adaptors_common
 from sky.adaptors import oci as oci_adaptor
@@ -496,26 +497,25 @@ def find_nsg(cls, region: str, nsg_name: str,
 
         compartment = cls.find_compartment(region)
 
-        list_vcns_resp = net_client.list_vcns(
-            compartment_id=compartment,
-            display_name=oci_utils.oci_config.VCN_NAME,
-            lifecycle_state='AVAILABLE',
-        )
-
-        if not list_vcns_resp:
-            raise exceptions.ResourcesUnavailableError(
-                'The VCN is not available')
+        vcn_id = oci_utils.oci_config.get_vcn_ocid(region)
+        if vcn_id is None:
+            list_vcns_resp = net_client.list_vcns(
+                compartment_id=compartment,
+                display_name=oci_utils.oci_config.VCN_NAME,
+                lifecycle_state='AVAILABLE',
+            )
 
-        # Get the primary vnic. The vnic might be an empty list for the
-        # corner case when the cluster was exited during provision.
-        if not list_vcns_resp.data:
-            return None
+            # Get the primary vnic. The vnic might be an empty list for the
+            # corner case when the cluster was exited during provision.
+            if not list_vcns_resp.data:
+                return None
 
-        vcn = list_vcns_resp.data[0]
+            vcn = list_vcns_resp.data[0]
+            vcn_id = vcn.id
 
         list_nsg_resp = net_client.list_network_security_groups(
             compartment_id=compartment,
-            vcn_id=vcn.id,
+            vcn_id=vcn_id,
             limit=1,
             display_name=nsg_name,
         )
@@ -532,7 +532,7 @@ def find_nsg(cls, region: str, nsg_name: str,
             create_network_security_group_details=oci_adaptor.oci.core.models.
             CreateNetworkSecurityGroupDetails(
                 compartment_id=compartment,
-                vcn_id=vcn.id,
+                vcn_id=vcn_id,
                 display_name=nsg_name,
             ))
         get_nsg_resp = net_client.get_network_security_group(
diff --git a/sky/utils/schemas.py b/sky/utils/schemas.py
index a424ae074b9..3194dc79da5 100644
--- a/sky/utils/schemas.py
+++ b/sky/utils/schemas.py
@@ -886,6 +886,9 @@ def get_config_schema():
                     'image_tag_gpu': {
                         'type': 'string',
                     },
+                    'vcn_ocid': {
+                        'type': 'string',
+                    },
                     'vcn_subnet': {
                         'type': 'string',
                     },