Lambert (December 31, 1922 – August 23, 2009) was a Canadian psychologist and a professor in the psychology department at McGill University (1954–1990).
Among the founders of psycholinguistics and sociolinguistics, he is known for his contributions to social and cross-cultural psychology (intergroup attitudes, child-rearing values, and psychological consequences of living in multicultural societies), language education (the French immersion program), and bilingualism (measurement of language dominance, attitudes and motivation in second-language learning, and social, cognitive, and neuropsychological consequences of bilingualism).