Trademarks Opposition Board

Learn about the role and activities of the Trademarks Opposition Board and obtain more information about the opposition proceedings and the section 45 proceedings.

The Trademarks Opposition Board (TMOB) acts on behalf of the Registrar with respect to two types of proceedings: opposition proceedings and section 45 proceedings.

The TMOB comprises of a chairperson, members, hearing officers, a manager and clerks. The chair, members and hearing officers each has delegated authority from the Registrar to conduct hearings and render decisions pursuant to the Trade-marks Act and Trade-marks Regulations.

The responsibilities of the TMOB with respect to opposition and section 45 proceedings include:


Section 45

Decisions and upcoming hearings


Database Search


Contact Us

For general enquiries, call our Client Service Centre at 1-866-997-1936 (toll-free) or 819-934-0544 (international).

Important: When writing to TMOB, you must indicate:

  • Attention: Oppositions or
  • Attention: Section 45

Facsimile: 819-953-CIPO (2476)


Trademarks Opposition Board
Canadian Intellectual Property Office
Innovation, Science and Economic Development Canada
Place du Portage, Phase 1
50 Victoria Street
Gatineau, QC K1A 0C9

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