This book examines what 'researching multilingually' means in practice and theory. It is multinational and transnational in scope, including the voices of both experienced and emerging scholars who reflect on the process of conducting, analyzing and reporting multilingual research in various settings. Together the chapters address issues including theorizing multilingualism and collaborative research with multilingual scholars and research participants; navigating insider or outsider positioning with research participants; making and accepting language choices among researchers and participants during research; translating and interpreting multilingual data; and confronting policy challenges of multilingual research design and reporting in English-dominant contexts. The book ties these processes to existing theories of multilingualism in research and proposes new ways of understanding best practices while also wrestling with challenges and at times 'failures' in the research process.