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 Trademarks Act and Trademarks Regulations.

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

  • assessing the initial request;
  • corresponding with both parties;
  • ruling on various interlocutory matters (oppositions proceedings only);
  • scheduling and conducting hearings; and
  • rendering decisions.


The filing of any document, request or correspondence related to:

  • domestic (national) opposition and section 45 proceedings; and,
  • oppositions to Protocol applications and section 45 cancellation proceedings against Protocol registrations

can be done through the TMOB's E-services.

To learn more about how to submit transactions through the TMOB's E-services, please consult the TMOB's E-services online help

Other trademark-related E-services

Contact Us



TMOB's E-services:
Select the General Correspondence tab from the main menu

Hearing Coordinator:


Please note that the TMOB returns all phone calls within 24 hours.

Canada and the United States:
1-866-997-1936 (toll-free)

International calls:


Mailing address

Important: Paper correspondence relating to an opposition or section 45 proceeding must be clearly addressed to the attention of the TMOB as follows:

Attn: Trademarks Opposition Board
Canadian Intellectual Property Office
Place du Portage I
50 Victoria Street
Gatineau, QC K1A 0C9

819-953-CIPO (2476)