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What is a MAC ID?

Your MAC ID is a unique identifier that provides you with personalized credientials to access to various resources such as Mosaic, email, library resources, wi-fi, etc. The timing of the access to resources varies by service and your individual status. For more information on your MAC ID, click here.

How do I get a MAC ID?

How do I activate my MAC ID?

How can I reset my password?

What if I forgot my password?

What if I forgot my MAC ID?

Does my MAC ID ever expire?

Why am I getting an message that my account is locked?

What if my name has changed?

Who should I contact if I have problems with my MAC ID?

How can non-employees get access to campus systems?

How can guests get a MAC ID?

Service Bulletins

  • MAC ID Password Expiry

    Beginning in May 2016, MAC ID passwords at McMaster expire annually. Learn more at

Service Desk

Client Self Service:
Hours: Monday - Friday
8:30 am - 4:30 pm
Phone: 905-525-9140 x24357 (2HELP)
Location: Main Campus BSB Rm. 245
Service Catalogue:

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