Trademarks Opposition Board

The Trademarks Opposition Board is comprised of a Chair, Members of the Board and Hearing officers who render quasi-judicial decisions in Opposition and Section 45 proceedings. Read more


See all information about Opposition

Section 45

See all information about Section 45

Upcoming Hearings

Upcoming Hearings


Database Search


Trademarks Opposition Board final decisions


See TMOB notices

Need assistance?

Obtain professional assistance from a Trademarks Agent in your region.

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
Industry Canada
Place du Portage, Phase 1
50 Victoria Street
Gatineau, QC K1A 0C9