Contact Us

National Headquarters Ottawa:

CSIS
PO BOX 9732 STN T
OTTAWA ON  K1G 4G4

Telephone: 613-993-9620
Fax: 613-231-0612

For people who are deaf or hard of hearing:
TTY and/or TDD *: 613-991-9228

* A TTY --or Teletypewriter, also known as a TDD or Telecommunications device for the deaf-- is a special device that lets people who are deaf, hard of hearing, or speech-impaired use the telephone to communicate, by allowing them to type messages back and forth to one another instead of talking and listening. A TTY is required at both ends of the conversation in order to communicate.

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