diff --git a/addons/google_calendar/models/calendar.py b/addons/google_calendar/models/calendar.py
index 12cb2e476ba..ffafbd77b84 100644
--- a/addons/google_calendar/models/calendar.py
+++ b/addons/google_calendar/models/calendar.py
@@ -132,7 +132,7 @@ class Meeting(models.Model):
         if google_event.exists(self.env):
             existing_attendees = self.browse(google_event.odoo_id(self.env)).attendee_ids
         attendees_by_emails = {tools.email_normalize(a.email): a for a in existing_attendees}
-        partners = self.env['mail.thread']._mail_find_partner_from_emails(emails, records=self, force_create=True)
+        partners = self._get_sync_partner(emails)
         for attendee in zip(emails, partners, google_attendees):
             email = attendee[0]
             if email in attendees_by_emails:
diff --git a/addons/google_calendar/models/calendar_recurrence_rule.py b/addons/google_calendar/models/calendar_recurrence_rule.py
index db179f6ffe1..4c195247698 100644
--- a/addons/google_calendar/models/calendar_recurrence_rule.py
+++ b/addons/google_calendar/models/calendar_recurrence_rule.py
@@ -92,7 +92,7 @@ class RecurrenceRule(models.Model):
         # We update the attendee status for all events in the recurrence
         google_attendees = gevent.attendees or []
         emails = [a.get('email') for a in google_attendees]
-        partners = self.env['mail.thread']._mail_find_partner_from_emails(emails, records=self, force_create=True)
+        partners = self._get_sync_partner(emails)
         existing_attendees = self.calendar_event_ids.attendee_ids
         for attendee in zip(emails, partners, google_attendees):
             email = attendee[0]
diff --git a/addons/google_calendar/models/google_sync.py b/addons/google_calendar/models/google_sync.py
index 89942e057d4..db161b60ac6 100644
--- a/addons/google_calendar/models/google_sync.py
+++ b/addons/google_calendar/models/google_sync.py
@@ -9,7 +9,7 @@ import pytz
 from dateutil.parser import parse
 
 from odoo import api, fields, models, registry, _
-from odoo.tools import ormcache_context
+from odoo.tools import ormcache_context, email_normalize
 from odoo.exceptions import UserError
 from odoo.osv import expression
 
@@ -284,6 +284,17 @@ class GoogleSync(models.AbstractModel):
     def _create_from_google(self, gevents, vals_list):
         return self.create(vals_list)
 
+    @api.model
+    def _get_sync_partner(self, emails):
+        normalized_emails = [email_normalize(contact) for contact in emails if email_normalize(contact)]
+        user_partners = self.env['mail.thread']._mail_search_on_user(normalized_emails, extra_domain=[('share', '=', False)])
+        partners = [user_partner for user_partner in user_partners]
+        remaining = [email for email in normalized_emails if
+                     email not in [partner.email_normalized for partner in partners]]
+        if remaining:
+            partners += self.env['mail.thread']._mail_find_partner_from_emails(remaining, records=self, force_create=True)
+        return partners
+
     @api.model
     def _odoo_values(self, google_event: GoogleEvent, default_reminders=()):
         """Implements this method to return a dict of Odoo values corresponding
diff --git a/addons/google_calendar/tests/test_sync_google2odoo.py b/addons/google_calendar/tests/test_sync_google2odoo.py
index 5e38fed597d..f7ce4c9f1ef 100644
--- a/addons/google_calendar/tests/test_sync_google2odoo.py
+++ b/addons/google_calendar/tests/test_sync_google2odoo.py
@@ -1047,3 +1047,32 @@ class TestSyncGoogle2Odoo(TestSyncGoogle):
         self.assertEqual(mails, ['odoobot@example.com'])
 
         self.assertGoogleAPINotCalled()
+
+    def test_several_users_have_the_same_mail(self):
+        # We want to chose the internal user
+        user1 = new_test_user(self.env, login='test@example.com', groups='base.group_portal')
+        user2 = new_test_user(self.env, login='calendar-user2')
+        user2.partner_id.email = 'test@example.com'
+        user1.partner_id.name = "A First in alphabet"
+        user2.partner_id.name = "B Second in alphabet"
+        values = {
+            'id': "abcd",
+            'description': 'coucou',
+            "updated": self.now,
+            'organizer': {'email': 'odoobot@example.com', 'self': True},
+            'summary': False,
+            'visibility': 'public',
+            'attendees': [{'email': 'test@example.com', 'responseStatus': 'accepted'}, {'email': 'test2@example.com', 'responseStatus': 'accepted'}],
+            'reminders': {'useDefault': True},
+            'start': {
+                'dateTime': '2020-01-13T16:00:00+01:00',
+                'timeZone': 'Europe/Brussels'
+            },
+            'end': {
+                'dateTime': '2020-01-13T20:00:00+01:00',
+                'timeZone': 'Europe/Brussels'
+            },
+        }
+        event = self.env['calendar.event']._sync_google2odoo(GoogleEvent([values]))
+        new_partner = self.env['res.partner'].search([('email', '=', 'test2@example.com')])
+        self.assertEqual(event.partner_ids.ids, [user2.partner_id.id, new_partner.id], "The internal user should be chosen")