diff --git a/app/services/whatsapp/incoming_message_service_helpers.rb b/app/services/whatsapp/incoming_message_service_helpers.rb
index e40dc408f..705babbba 100644
--- a/app/services/whatsapp/incoming_message_service_helpers.rb
+++ b/app/services/whatsapp/incoming_message_service_helpers.rb
@@ -47,6 +47,15 @@ module Whatsapp::IncomingMessageServiceHelpers
     %w[reaction ephemeral unsupported request_welcome].include?(message_type)
   end
 
+  def argentina_phone_number?(phone_number)
+    phone_number.match(/^54/)
+  end
+
+  def normalised_argentina_mobil_number(phone_number)
+    # Remove 9 before country code
+    phone_number.sub(/^549/, '54')
+  end
+
   def processed_waid(waid)
     Whatsapp::PhoneNumberNormalizationService.new(inbox).normalize_and_find_contact(waid)
   end
diff --git a/app/services/whatsapp/phone_normalizers/argentina_phone_normalizer.rb b/app/services/whatsapp/phone_normalizers/argentina_phone_normalizer.rb
new file mode 100644
index 000000000..109a0683f
--- /dev/null
+++ b/app/services/whatsapp/phone_normalizers/argentina_phone_normalizer.rb
@@ -0,0 +1,18 @@
+# Handles Argentina phone number normalization
+#
+# Argentina phone numbers can appear with or without "9" after country code
+# This normalizer removes the "9" when present to create consistent format: 54 + area + number
+class Whatsapp::PhoneNormalizers::ArgentinaPhoneNormalizer < Whatsapp::PhoneNormalizers::BasePhoneNormalizer
+  def normalize(waid)
+    return waid unless handles_country?(waid)
+
+    # Remove "9" after country code if present (549 → 54)
+    waid.sub(/^549/, '54')
+  end
+
+  private
+
+  def country_code_pattern
+    /^54/
+  end
+end
diff --git a/app/services/whatsapp/phone_number_normalization_service.rb b/app/services/whatsapp/phone_number_normalization_service.rb
index b8e416794..cd10db0d0 100644
--- a/app/services/whatsapp/phone_number_normalization_service.rb
+++ b/app/services/whatsapp/phone_number_normalization_service.rb
@@ -1,5 +1,5 @@
 # Service to handle phone number normalization for WhatsApp messages
-# Currently supports Brazil phone number format variations
+# Currently supports Brazil and Argentina phone number format variations
 # Designed to be extensible for additional countries in future PRs
 #
 # Usage: Whatsapp::PhoneNumberNormalizationService.new(inbox).normalize_and_find_contact(waid)
@@ -34,6 +34,7 @@ class Whatsapp::PhoneNumberNormalizationService
   end
 
   NORMALIZERS = [
-    Whatsapp::PhoneNormalizers::BrazilPhoneNormalizer
+    Whatsapp::PhoneNormalizers::BrazilPhoneNormalizer,
+    Whatsapp::PhoneNormalizers::ArgentinaPhoneNormalizer
   ].freeze
 end
diff --git a/spec/services/whatsapp/incoming_message_service_spec.rb b/spec/services/whatsapp/incoming_message_service_spec.rb
index ede1ba824..6c23e9b71 100644
--- a/spec/services/whatsapp/incoming_message_service_spec.rb
+++ b/spec/services/whatsapp/incoming_message_service_spec.rb
@@ -341,6 +341,58 @@ describe Whatsapp::IncomingMessageService do
       end
     end
 
+    describe 'When the incoming waid is an Argentine number with 9 after country code' do
+      let(:wa_id) { '5491123456789' }
+
+      it 'creates appropriate conversations, message and contacts if contact does not exist' do
+        described_class.new(inbox: whatsapp_channel.inbox, params: params).perform
+        expect(whatsapp_channel.inbox.conversations.count).not_to eq(0)
+        expect(Contact.all.first.name).to eq('Sojan Jose')
+        expect(whatsapp_channel.inbox.messages.first.content).to eq('Test')
+        expect(whatsapp_channel.inbox.contact_inboxes.first.source_id).to eq(wa_id)
+      end
+
+      it 'appends to existing contact if contact inbox exists with normalized format' do
+        # Normalized format removes the 9 after country code
+        normalized_wa_id = '541123456789'
+        contact_inbox = create(:contact_inbox, inbox: whatsapp_channel.inbox, source_id: normalized_wa_id)
+        last_conversation = create(:conversation, inbox: whatsapp_channel.inbox, contact_inbox: contact_inbox)
+        described_class.new(inbox: whatsapp_channel.inbox, params: params).perform
+        # no new conversation should be created
+        expect(whatsapp_channel.inbox.conversations.count).to eq(1)
+        # message appended to the last conversation
+        expect(last_conversation.messages.last.content).to eq(params[:messages].first[:text][:body])
+        # should use the normalized wa_id from existing contact
+        expect(whatsapp_channel.inbox.contact_inboxes.first.source_id).to eq(normalized_wa_id)
+      end
+    end
+
+    describe 'When incoming waid is an Argentine number without 9 after country code' do
+      let(:wa_id) { '541123456789' }
+
+      context 'when a contact inbox exists with the same format' do
+        it 'appends to existing contact' do
+          contact_inbox = create(:contact_inbox, inbox: whatsapp_channel.inbox, source_id: wa_id)
+          last_conversation = create(:conversation, inbox: whatsapp_channel.inbox, contact_inbox: contact_inbox)
+          described_class.new(inbox: whatsapp_channel.inbox, params: params).perform
+          # no new conversation should be created
+          expect(whatsapp_channel.inbox.conversations.count).to eq(1)
+          # message appended to the last conversation
+          expect(last_conversation.messages.last.content).to eq(params[:messages].first[:text][:body])
+        end
+      end
+
+      context 'when a contact inbox does not exist' do
+        it 'creates contact inbox with the incoming waid' do
+          described_class.new(inbox: whatsapp_channel.inbox, params: params).perform
+          expect(whatsapp_channel.inbox.conversations.count).not_to eq(0)
+          expect(Contact.all.first.name).to eq('Sojan Jose')
+          expect(whatsapp_channel.inbox.messages.first.content).to eq('Test')
+          expect(whatsapp_channel.inbox.contact_inboxes.first.source_id).to eq(wa_id)
+        end
+      end
+    end
+
     describe 'when message processing is in progress' do
       it 'ignores the current message creation request' do
         params = { 'contacts' => [{ 'profile' => { 'name' => 'Kedar' }, 'wa_id' => '919746334593' }],