Pidgins, narrowly defined, are auxiliary languages reserved for communication with linguistic outgroups. Although implicitly recognized as a class of languages by many linguists, there has been little systematic typological investigation of pidgins. This dissertation presents the first large-scale typological study of morphology and functional categories in pidgins, examining a set of 61 pidgins from a largely synchronic perspective. After discussion of this dissertation's operational definition for the term "pidgin" (chapter 1) and a brief summary of the language varieties considered in this study (chapter 2), the dissertation's primary descriptive chapters examine personal pronouns and demonstratives (chapter 3), numeral systems (chapter 4), inflection (chapter 5), and derivation (chapter 6). The synchronic examinations of inflection and derivation demonstrate that pidgins possess a rather wide variety of inflectional and derivational categories, although these categories differ in their frequency and obligatoriness, with only a minority of pidgins possessing more than a handful of such categories. In two other functional domains, which are considered both diachronically and synchronically, pidgins lack a firm structural prototype, but exhibit tendencies toward reduction (in pronominal systems) and retention (in numeral systems), respectively. A seventh chapter addresses the typological question of the prevalence of reduplication in pidgins and critically evaluates a proposed implicational hierarchy for inflectional categories attested in pidgins. Appendices summarize all available data on the pronominal categories of personal pronouns, possessives, and demonstratives (Appendix A); present the available data on pidgin numeral systems (Appendix B); and offer pidgin-by-pidgin summaries of inflectional categories (Appendix C) and derivational categories (Appendix D). [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]