diff --git a/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java b/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java
index 55dd6a8d6ad..ab878a4d2a5 100644
--- a/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java
+++ b/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -293,8 +293,10 @@ public class CLDRConverter {
         bundleGenerator = new ResourceBundleGenerator();
 
         // Parse data independent of locales
-        parseSupplemental();
+        // parseBCP47() must precede parseSupplemental(). The latter depends
+        // on IANA alias map, which is produced by the former.
         parseBCP47();
+        parseSupplemental();
 
         // rules maps
         pluralRules = generateRules(handlerPlurals);
@@ -536,6 +538,12 @@ public class CLDRConverter {
 
         // canonical tz name map
         // alias -> primary
+        //
+        // Note that CLDR meta zones do not necessarily align with IANA's
+        // current time zone identifiers. For example, the CLDR "India"
+        // meta zone maps to "Asia/Calcutta", whereas IANA now uses
+        // "Asia/Kolkata" for the zone. Accordingly, "canonical" here is
+        // defined in terms of CLDR's zone mappings.
         handlerTimeZone.getData().forEach((k, v) -> {
             String[] ids = ((String)v).split("\\s");
             for (int i = 1; i < ids.length; i++) {
diff --git a/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java b/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java
index 66e94e5ca06..8203a9f0b91 100644
--- a/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java
+++ b/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,9 @@ package build.tools.cldrconverter;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.xml.sax.Attributes;
 import org.xml.sax.InputSource;
@@ -40,6 +43,10 @@ import org.xml.sax.SAXException;
 class TimeZoneParseHandler extends AbstractLDMLHandler<Object> {
     private static final String PREF_PREFIX = "preferred:";
 
+    // CLDR aliases to IANA ids map. The initial capacity is estimated
+    // from the number of aliases in timezone.xml as of CLDR v48
+    private final Map<String, String> ianaAliasMap = HashMap.newHashMap(32);
+
     @Override
     public InputSource resolveEntity(String publicID, String systemID) throws IOException, SAXException {
         // avoid HTTP traffic to unicode.org
@@ -61,7 +68,16 @@ class TimeZoneParseHandler extends AbstractLDMLHandler<Object> {
                         put(attributes.getValue("name"), PREF_PREFIX + preferred);
                     }
                 } else {
-                    put(attributes.getValue("name"), attributes.getValue("alias"));
+                    var alias = attributes.getValue("alias");
+                    var iana = attributes.getValue("iana");
+                    if (iana != null) {
+                        for (var a : alias.split("\\s+")) {
+                            if (!a.equals(iana)) {
+                                ianaAliasMap.put(a, iana);
+                            }
+                        }
+                    }
+                    put(attributes.getValue("name"), alias);
                 }
             }
             break;
@@ -80,4 +96,8 @@ class TimeZoneParseHandler extends AbstractLDMLHandler<Object> {
             .forEach(e -> map.put(e.getKey(),
                 map.get(e.getValue().toString().substring(PREF_PREFIX.length()))));
     }
+
+    Map<String, String> getIanaAliasMap() {
+        return ianaAliasMap;
+    }
 }
diff --git a/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java b/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java
index a584358f0cb..343e143b6ad 100644
--- a/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java
+++ b/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -56,6 +56,7 @@ class WinZonesParseHandler extends AbstractLDMLHandler<Object> {
             String zoneName = attributes.getValue("other");
             String territory = attributes.getValue("territory");
             String javatz = attributes.getValue("type").replaceFirst("\\s.*", "");
+            javatz = CLDRConverter.handlerTimeZone.getIanaAliasMap().getOrDefault(javatz, javatz);
             put(zoneName + ":" + territory, javatz);
             pushIgnoredContainer(qName);
             break;