Ever since the beginnings of the Internet, how the self has been constructed and understood in cyberspace has been an area of concern. Are we different people online from the people we are offline, or does the Internet provide us with new opportunities to gain greater insights about ourselves? Do the selves we create in cyberspace transcend to other spaces? This chapter provides an overview of some of the key psychological theories and research that have examined the self in cyberspace. It is recognized in this chapter that scholars operationalize the self in various ways. We are not promoting one theory over another but rather highlighting some of the more influential work carried out in the field.