How do I cancel a missing card?

You can cancel a BMO Debit Card or BMO MasterCard quickly and easily with the following two options:

  1. During business hours, contact your nearest BMO Bank of Montreal branch
  2. If you need to cancel after hours, call us 1-877-CALL-BMO or 1-800-361-3361 for BMO MasterCard.

We recommend that you contact us within 24 of discovering that your card is missing.