National Occupational Classification, or NOC, is a systematic taxonomy of all occupations in the Canadian labour market. As a Canadian government publication it is concurrently published in French as Classification nationale des professions.^[1] The NOC a joint project between Employment and Social Development Canada (ESDC) and Statistics Canada and classifies over 30,000 occupational titles into 500 Unit Groups, organized according to 4 skill levels and 10 skill types.^[2]

The NOC is used by students, workers, employers, career and vocational counsellors, educational and training organizations. The first Edition of the NOC was published in 1992, and a Second Revised Edition was offered in 2001. Further minor revisions were made in 2006. The 2011 revision combined the variation National Occupational Classification for Statistics (NOC-S) and the 2006 NOC version into one system with structural changes.^[3] The 2016 revision was minor and the NOC content is now continually updated; however its structure is set to be revised every 10 years.^[4] It is available online. The 2021 version will be a structural revision.

The NOC supersedes the Canadian Classification Dictionary of Occupations (CCDO), which was published by the then Human Resources and Skills Development Canada (HRSDC) (now ESDC) in 1981.^[5]