diff --git a/erpnext/controllers/queries.py b/erpnext/controllers/queries.py
index 492726141ee..1f8fda36cce 100644
--- a/erpnext/controllers/queries.py
+++ b/erpnext/controllers/queries.py
@@ -73,14 +73,17 @@ def employee_query(
 		.where(Criterion.any(search_conditions))
 		.orderby(
 			Case()
-			.when(Locate(txt_no_percent, Employee.name) > 0, Locate(txt_no_percent, Employee.name))
+			.when(
+				Locate(Lower(txt_no_percent), Lower(Employee.name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(Employee.name)),
+			)
 			.else_(99999)
 		)
 		.orderby(
 			Case()
 			.when(
-				Locate(txt_no_percent, Employee.employee_name) > 0,
-				Locate(txt_no_percent, Employee.employee_name),
+				Locate(Lower(txt_no_percent), Lower(Employee.employee_name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(Employee.employee_name)),
 			)
 			.else_(99999)
 		)
@@ -136,17 +139,28 @@ def lead_query(
 		query.where(Lead.docstatus < 2)
 		.where(Lead.status.isnull() | (Lead.status != "Converted"))
 		.where(Criterion.any(search_conditions))
-		.orderby(
-			Case().when(Locate(txt_no_percent, Lead.name) > 0, Locate(txt_no_percent, Lead.name)).else_(99999)
-		)
 		.orderby(
 			Case()
-			.when(Locate(txt_no_percent, Lead.lead_name) > 0, Locate(txt_no_percent, Lead.lead_name))
+			.when(
+				Locate(Lower(txt_no_percent), Lower(Lead.name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(Lead.name)),
+			)
 			.else_(99999)
 		)
 		.orderby(
 			Case()
-			.when(Locate(txt_no_percent, Lead.company_name) > 0, Locate(txt_no_percent, Lead.company_name))
+			.when(
+				Locate(Lower(txt_no_percent), Lower(Lead.lead_name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(Lead.lead_name)),
+			)
+			.else_(99999)
+		)
+		.orderby(
+			Case()
+			.when(
+				Locate(Lower(txt_no_percent), Lower(Lead.company_name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(Lead.company_name)),
+			)
 			.else_(99999)
 		)
 		.orderby(Lead.idx, order=Order.desc)
@@ -387,7 +401,12 @@ def bom(
 		.where(BOM.is_active == 1)
 		.where(BOM[searchfield].like(f"%{txt}%"))
 		.orderby(
-			Case().when(Locate(txt_no_percent, BOM.name) > 0, Locate(txt_no_percent, BOM.name)).else_(99999)
+			Case()
+			.when(
+				Locate(Lower(txt_no_percent), Lower(BOM.name)) > 0,
+				Locate(Lower(txt_no_percent), Lower(BOM.name)),
+			)
+			.else_(99999)
 		)
 		.orderby(BOM.idx, order=Order.desc)
 		.orderby(BOM.name)
diff --git a/erpnext/controllers/tests/test_queries.py b/erpnext/controllers/tests/test_queries.py
index ff48ad7ed1d..3bab76ee1fa 100644
--- a/erpnext/controllers/tests/test_queries.py
+++ b/erpnext/controllers/tests/test_queries.py
@@ -29,6 +29,27 @@ class TestQueries(ERPNextTestSuite):
 		self.assertGreaterEqual(len(query(txt="_Test Lead")), 4)
 		self.assertEqual(len(query(txt="_Test Lead 4")), 1)
 
+	def test_lead_query_ranking_is_case_insensitive(self):
+		"""A match at the start must rank first whatever its case.
+
+		The filter uses .like(), which frappe renders as ILIKE on PostgreSQL, so both leads match.
+		Ranking used a bare Locate(), which becomes case-sensitive strpos() there: the upper-cased
+		lead scores no match, falls back to 99999 and sorts last, while MariaDB's case-insensitive
+		LOCATE ranks it first. Same query, different order -- and a different page when page_len is
+		small enough to cut between them.
+		"""
+		early, late = "ZZABCD Ranking Lead", "Ranking Lead zzabcd"
+		for lead_name in (early, late):
+			if not frappe.db.exists("Lead", {"lead_name": lead_name}):
+				frappe.get_doc({"doctype": "Lead", "lead_name": lead_name}).insert()
+
+		query = add_default_params(queries.lead_query, "Lead")
+		names = [row[1] for row in query(txt="zzabcd")]
+
+		self.assertIn(early, names)
+		self.assertIn(late, names)
+		self.assertLess(names.index(early), names.index(late))
+
 	def test_item_query(self):
 		query = add_default_params(queries.item_query, "Item")