The recruitment of skilled workers with expertise in science, technology, engineering and mathematics (STEM) is a core component of North American immigration policies. However, few studies examine the labour market integration of immigrant STEM educated workers. Multivariate analysis of the 2011 National Household Survey show that STEM educated immigrants who arrive as adults are less likely than the Canadian born to have STEM jobs and they earn less than their Canadian born counterparts. These patterns partly reflect their socio‐demographic characteristics, particularly their lower language proficiencies (measured as a combination of mother tongue and languages spoken at home) and the receipt of their degrees in institutions outside of Canada. These immigrant workers arrived primarily in the skilled worker programme that did not require pre‐arranged employment. Policy changes in recruitment and their implications for future STEM immigrant workers are discussed in the conclusion.