This study investigates the relationship between proficiency in English and language-related attitudes among Swedish professionals at the English-speaking AstraZeneca R&D site in Molndal, Sweden. AstraZeneca is the result of a merger between a Swedish and a British pharmaceutical company, and the aim of the study is to see to what extent their relative proficiency in English may be related to attitude formation among Swedish workers in the new corporate setting. The results indicate that there is a correlation between good proficiency in English and a favourable attitude towards the merger and its consequences. The results are interpreted as indicating that subjectively perceived cultural problems in a multinational corporate setting may be a reflection of language deficiencies. (Contains 10 tables.)