This study aims to examine STEM graduates' retention in Canada after completing Canadian postsecondary programs. The retention of STEM graduates has improved in the last decade for both Canadian and international students. However, retention varied by educational and demographic characteristics. Canadian STEM graduates generally showed higher retention rates compared with international graduates. Among Canadian students, graduates from mathematics and computer and information science programs, graduates with a doctoral degree, and graduates from high-ranking universities were less likely to stay in Canada than other students. The lower retention rates among graduates from high-ranking universities and those with advanced degrees are particularly insightful. Among international students, graduates from engineering and computer and information science, graduates from master's degree programs, and graduates from India were more likely to stay in Canada. The majority of American students left after completing their postsecondary studies.