This qualitative case study deals with management of multilingualism at the workplace in a multinational IT company in the Czech Republic. The multilingualism at the workplace was thoroughly described pursuant to using qualitatively won data (semi-structured interviews, ethnographic observations, additional written material) without making preliminary hypotheses. Thematically, this study aims at the employees'origin and their language knowledge, languages and their influence on job performance and hierarchical ranking, internal and external communication (language problems, communication channel, communication strategies), official language, interpreting and translating, language courses, multicultural milieu and identity.