It has been argued that both strengths and weaknesses of diversity in organisations stem from the different demographic, national, linguistic, social and cultural backgrounds of their members. However, few attempts have been made to link different types of diversity to knowledge sharing despite the fact that organisations which can make full use of their collective knowledge and expertise could be expected to be more efficient, effective and creative. Therefore, a survey was directed towards 16 diverse academic departments in three large universities in Denmark, and 489 academics took part. As predicted, results showed that diversity related to internationalisation (cultural and linguistic) had more positive associations with knowledge sharing than inherent demographic diversity (age and gender), which generally had negative or no relationships with knowledge sharing. The implications of these findings for the management of knowledge in intensive diverse organisations are discussed in detail.