Language is a social behavior and a key aspect of social interaction. Language is ubiquitous and usually occurs with other human behaviors across diverse contexts. Thus, it is difficult to study it in isolation. This difficulty may be why most, albeit not all, social psychologists tend to neglect language, in spite of the prominence of language in early 20th century social psychology and the presence of numerous handbooks and reviews of this area. Language use has implications for many social psychological processes, and, given its role in daily social life, it is important to understand its social underpinnings. The field of language and social psychology highlights the relationship between language and communication and foregrounds the differences between the social-psychological and communication approaches. One central issue is bilingualism and the relationships among language, identity, and culture. Another is methodology, where social psychologists have tended to choose experimental and survey strategies to look at language (not always to the best advantage). This century has seen the development of new technologies that allow us to look at language on a large scale and in rich detail and that have the potential to transform this research. In part as a consequence, in the early 21st century there are many new topics emerging in language and social psychology that help to set a new agenda for future research.