This study found that vaccination behaviours in nurses were more complex requiring an analysis of both vaccinated and unvaccinated nurses' behaviours. More levels of vaccination behaviours existed in the sample with the two-step cluster analysis revealing three whole population clusters, i.e. those never vaccinated, those vaccinated this season with intent next year, and those with other vaccination history. Two clusters, the newly vaccinated and continuously vaccinated, were identified for the vaccinated group and another two clusters, never vaccinated and used to be vaccinated, were identified in the unvaccinated group. To improve the influenza vaccination rates in nurses, it may be helpful to develop different strategies which target the nurse groups of the never vaccinated and the occasionally vaccinated.