Although organisational creativity has become an increasingly important performance driver, little is known about how it can be built and stimulated. The existing literature has mostly focused on techniques for improving idea generation in specific and occasional problem-solving situations. However, there is scarce research about how to improve creativity as a quality that pervades everyday operations throughout an organisation. This study explores how theatrical improvisation could foster organisational creativity. Qualitative action research shows theatrical improvisation as a promising method to stimulate both individual and collective creativity in an organisation. The study links theatrical improvisation to organisational creativity, understanding the former as a potential method for organisational development. This research extends the understanding about enhancing organisational creativity as a multilevel phenomenon, as well as the possibilities for applying arts-based methods to organisational development.