The leader of the Opposition in British Columbia is the member of the Legislative Assembly (MLA) in the Legislative Assembly of British Columbia who leads the political party recognized as the Official Opposition. This position generally goes to the leader of the largest party in the Legislative Assembly that is not in government.

The Legislative Assembly of British Columbia is the deliberative assembly of the Parliament of British Columbia, in the province of British Columbia, Canada. The other component of Parliament is the lieutenant governor of British Columbia. The assembly has 87 elected members and meets in Victoria. Members are elected from provincial ridings and are referred to as members of the Legislative Assembly (MLAs). Bills passed by the assembly are given royal assent by the lieutenant governor in the name of the King of Canada.