A survey of research on French as a second language (FSL) education in Canada suggests that French immersion (FI) students enjoy significant linguistic, academic, and cognitive benefits. We organize our summary of the advantages of FI around these three themes, comparing students' proficiency in French and English across various FI programs, and assessing their overall academic achievement. Our review shows that FI programs enable students to develop high levels of proficiency in both French and English, at no cost to their academic success. Cognitive research associates bilingualism with heightened mental flexibility and creative thinking skills, enhanced metalinguistic awareness, and greater communicative sensitivity. Because cognitive benefits are contingent on a bilingual learner's proficiency in both languages, it may be that FI programs, which promote heightened proficiency in both French and English, foster in their students an underlying cognitive advantage.