The aim of the article is to investigate the mediational role of crowdsourcing in the relationship between employee engagement and innovative behaviour. The data for the study were collected using a survey questionnaire in 205 municipal offices in Poland which make use of crowdsourcing. Credibility and validity were confirmed by factor analysis. Correlation and regression analysis were used to test the hypotheses. The research results show that crowdsourcing mediates in the relationship between employee engagement and innovation behaviour. These discoveries provide useful information for local governments, especially for those which use crowdsourcing and want to maximise the benefits of this. The conclusions emphasise that employee engagement supports the implementation and use of crowdsourcing, which facilitates the shaping of innovative behaviour. The implications for future research and management practice are further discussed. The results are limited since the study was conducted only in one region, i.e. in Poland, and the data were collected from public organisations, more precisely municipal offices.