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Login Help & Support


To login

  • Please ensure Caps Lock is off. The form fields are case sensitive.
  • If you receive an error message “Login could not be completed due to unregistered account”. This means that either you don't have an online account or you made a mistake with your email and/or your password.
  • Please try logging in again ensuring that you have entered your email and password correctly. If you do not have a password that would mean you do not have an online account.
  • If you don't have an online account, please register for an online account
  • If you require help to register your membership, please follow our guide to register for an online account.
  • If you continue to have difficulties logging in, please contact customer care by email customercare@costco.co.uk providing your membership number and email address you want to register and they will be happy to assist you.

icon-note Please note an online account is not created automatically when you sign up at a warehouse. If you do not have an online account, please follow our steps to register for an Online Account.