diff --git a/erpnext/buying/doctype/supplier/supplier.py b/erpnext/buying/doctype/supplier/supplier.py
index b7732856e99..ad594d2d72e 100644
--- a/erpnext/buying/doctype/supplier/supplier.py
+++ b/erpnext/buying/doctype/supplier/supplier.py
@@ -16,7 +16,10 @@ from erpnext.accounts.party import (
 	validate_party_accounts,
 	validate_party_currency_before_merging,
 )
-from erpnext.controllers.website_list_for_contact import add_role_for_portal_user
+from erpnext.controllers.website_list_for_contact import (
+	add_role_for_portal_user,
+	link_portal_users_to_contacts,
+)
 from erpnext.utilities.transaction_base import TransactionBase
 
 
@@ -109,6 +112,7 @@ class Supplier(TransactionBase):
 	def on_update(self):
 		self.create_primary_contact()
 		self.create_primary_address()
+		link_portal_users_to_contacts(self)
 
 	def add_role_for_user(self):
 		for portal_user in self.portal_users:
diff --git a/erpnext/controllers/website_list_for_contact.py b/erpnext/controllers/website_list_for_contact.py
index 88eb325b47a..652c5429990 100644
--- a/erpnext/controllers/website_list_for_contact.py
+++ b/erpnext/controllers/website_list_for_contact.py
@@ -7,6 +7,8 @@ import json
 import frappe
 from frappe import _
 from frappe.modules.utils import get_module_app
+from frappe.query_builder import Criterion
+from frappe.query_builder.functions import Lower
 from frappe.utils import cint, flt, has_common
 from frappe.utils.user import is_website_user
 
@@ -306,3 +308,63 @@ def add_role_for_portal_user(portal_user, role):
 
 	user_doc.add_roles(role)
 	frappe.msgprint(_("Added {1} Role to User {0}.").format(frappe.bold(user_doc.name), role), alert=True)
+
+
+def link_portal_users_to_contacts(doc):
+	"""When portal users are added to Supplier/Customer, link them to the Contact profile."""
+	# a User's name is its (lowercased) email, so portal_users are already the emails
+	portal_users = {p.user for p in doc.get("portal_users") or [] if p.user}
+	if not portal_users:
+		return
+
+	before = doc.get_doc_before_save()
+	if before:
+		previous_users = {p.user for p in before.get("portal_users") or [] if p.user}
+		if portal_users == previous_users:
+			return
+
+	portal_users = list(portal_users)
+
+	contact = frappe.qb.DocType("Contact")
+	contact_email = frappe.qb.DocType("Contact Email")
+
+	query = (
+		frappe.qb.from_(contact)
+		.left_join(contact_email)
+		.on(contact_email.parent == contact.name)
+		.select(contact.name)
+		.distinct()
+	)
+
+	conditions = [
+		contact.user.isin(portal_users),
+		Lower(contact.email_id).isin(portal_users),
+		Lower(contact_email.email_id).isin(portal_users),
+	]
+
+	query = query.where(Criterion.any(conditions))
+	contacts = query.run(pluck=True)
+
+	if not contacts:
+		return
+
+	dynamic_link = frappe.qb.DocType("Dynamic Link")
+	existing_links = (
+		frappe.qb.from_(dynamic_link)
+		.select(dynamic_link.parent)
+		.where(
+			(dynamic_link.parenttype == "Contact")
+			& (dynamic_link.parent.isin(contacts))
+			& (dynamic_link.link_doctype == doc.doctype)
+			& (dynamic_link.link_name == doc.name)
+		)
+		.run(pluck=True)
+	)
+
+	contacts_to_link = [name for name in contacts if name not in existing_links]
+
+	for name in contacts_to_link:
+		contact_doc = frappe.get_doc("Contact", name)
+		if not contact_doc.has_link(doc.doctype, doc.name):
+			contact_doc.append("links", {"link_doctype": doc.doctype, "link_name": doc.name})
+			contact_doc.save(ignore_permissions=True)
diff --git a/erpnext/selling/doctype/customer/customer.py b/erpnext/selling/doctype/customer/customer.py
index ea11c3696cb..971170d8335 100644
--- a/erpnext/selling/doctype/customer/customer.py
+++ b/erpnext/selling/doctype/customer/customer.py
@@ -24,7 +24,10 @@ from erpnext.accounts.party import (
 	validate_party_accounts,
 	validate_party_currency_before_merging,
 )
-from erpnext.controllers.website_list_for_contact import add_role_for_portal_user
+from erpnext.controllers.website_list_for_contact import (
+	add_role_for_portal_user,
+	link_portal_users_to_contacts,
+)
 from erpnext.utilities.transaction_base import TransactionBase
 
 
@@ -273,6 +276,8 @@ class Customer(TransactionBase):
 
 		self.update_customer_groups()
 
+		link_portal_users_to_contacts(self)
+
 	def add_role_for_user(self):
 		for portal_user in self.portal_users:
 			add_role_for_portal_user(portal_user, "Customer")