diff --git a/legal-api/src/legal_api/services/filings/validations/common_validations.py b/legal-api/src/legal_api/services/filings/validations/common_validations.py
index a50a2bf2e4..725fa9522f 100644
--- a/legal-api/src/legal_api/services/filings/validations/common_validations.py
+++ b/legal-api/src/legal_api/services/filings/validations/common_validations.py
@@ -953,10 +953,13 @@ def validate_foreign_jurisdiction(foreign_jurisdiction: dict,
             msg.append({"error": "Region should not be BC.", "path": f"{foreign_jurisdiction_path}/region"})
         elif not (region == "FEDERAL" or pycountry.subdivisions.get(code=f"{country_code}-{region}")):
             msg.append({"error": "Invalid region.", "path": f"{foreign_jurisdiction_path}/region"})
-    elif (country_code == "US" and
-          is_region_for_us_required and
-          not pycountry.subdivisions.get(code=f"{country_code}-{region}")):
-        msg.append({"error": "Invalid region.", "path": f"{foreign_jurisdiction_path}/region"})
+    elif country_code == "US":
+        if (is_region_for_us_required and
+                not pycountry.subdivisions.get(code=f"{country_code}-{region}")):
+            msg.append({"error": "Invalid region.", "path": f"{foreign_jurisdiction_path}/region"})
+    elif region:
+        msg.append({"error": "Region must not be provided for this jurisdiction.",
+                    "path": f"{foreign_jurisdiction_path}/region"})
 
     return msg
 
diff --git a/legal-api/tests/unit/services/filings/validations/test_common_validations.py b/legal-api/tests/unit/services/filings/validations/test_common_validations.py
index 263d6f402c..93f3c841d9 100644
--- a/legal-api/tests/unit/services/filings/validations/test_common_validations.py
+++ b/legal-api/tests/unit/services/filings/validations/test_common_validations.py
@@ -55,6 +55,7 @@
     validate_certified_by,
     validate_court_order,
     validate_email,
+    validate_foreign_jurisdiction,
     validate_offices,
     validate_offices_addresses,
     validate_share_currency,
@@ -2195,3 +2196,100 @@ def test_validate_share_currency_skips_no_par_value(session):
     result = validate_share_currency(filing, 'incorporationApplication')
     assert result == []
 
+@pytest.mark.parametrize('test_name, foreign_jurisdiction, is_region_bc_valid, is_region_for_us_required, expected_errors', [
+    (
+        'invalid country code',
+        {'country': 'XX', 'region': ''},
+        False,
+        True,
+        [{'error': 'Invalid country.', 'path': '/filing/continuationIn/foreignJurisdiction/country'}]
+    ),
+    (
+        'BC region provided when not allowed',
+        {'country': 'CA', 'region': 'BC'},
+        False,
+        True,
+        [{'error': 'Region should not be BC.', 'path': '/filing/continuationIn/foreignJurisdiction/region'}]
+    ),
+    (
+        'valid CA region provided',
+        {'country': 'CA', 'region': 'BC'},
+        True,
+        True,
+        []
+    ),
+    (
+        'valid CA region provided other than BC',
+        {'country': 'CA', 'region': 'ON'},
+        False,
+        True,
+        []
+    ),
+    (
+        'valid CA FEDERAL region provided',
+        {'country': 'CA', 'region': 'FEDERAL'},
+        False,
+        True,
+        []
+    ),
+    (
+        'invalid CA region provided',
+        {'country': 'CA', 'region': 'XX'},
+        False,
+        True,
+        [{'error': 'Invalid region.', 'path': '/filing/continuationIn/foreignJurisdiction/region'}]
+    ),
+    (
+        'valid US region provided',
+        {'country': 'US', 'region': 'WA'},
+        False,
+        True,
+        []
+    ),
+    (
+        'invalid US region provided when region is required',
+        {'country': 'US', 'region': 'XX'},
+        False,
+        True,
+        [{'error': 'Invalid region.', 'path': '/filing/continuationIn/foreignJurisdiction/region'}]
+    ),
+    (
+        'invalid US region provided when region is not required',
+        {'country': 'US', 'region': 'XX'},
+        False,
+        False,
+        []
+    ),
+    (
+        'international with no region',
+        {'country': 'AU', 'region': ''},
+        False,
+        True,
+        []
+    ),
+    (
+        'international with null region',
+        {'country': 'AU', 'region': None},
+        False,
+        True,
+        []
+    ),
+    (
+        'international with region provided',
+        {'country': 'AU', 'region': 'NSW'},
+        False,
+        True,
+        [{'error': 'Region must not be provided for this jurisdiction.', 'path': '/filing/continuationIn/foreignJurisdiction/region'}]
+    ),
+])
+def test_validate_foreign_jurisdiction(session, test_name, foreign_jurisdiction, is_region_bc_valid,
+                                       is_region_for_us_required, expected_errors):
+    """Test foreign jurisdiction validation."""
+    path = '/filing/continuationIn/foreignJurisdiction'
+    errors = validate_foreign_jurisdiction(
+        foreign_jurisdiction,
+        path,
+        is_region_bc_valid=is_region_bc_valid,
+        is_region_for_us_required=is_region_for_us_required
+    )
+    assert errors == expected_errors