The World Health Organization recommends flu vaccination as the most effective way to prevent the disease and its severe outcomes and has established the minimum vaccination coverage for people at risk at 75%. Even though healthcare workers (HCWs) represent a strongly recommended target group for flu vaccination campaigns, the average coverage among them is still inadequate. In flu season 2015/2016, our University Hospital tested Forum Theatre (FT) as a new participative strategy to foster HCWs engagement regarding flu vaccination. The aim of this study was to evaluate HCWs' satisfaction with and perceived utility of FT. In 2015, five FT sessions were organized in hospital units which were considered at risk for flu based on the type of admitted patients. After each session, participants were asked to complete an assessment questionnaire. The χ² test or the t-test was used to compare the proportion of participants who were satisfied with the FT and considered it useful (utility score). Data was analyzed according to gender, profession, and age. In all, 16.5% of HCWs who worked in four out of five of the units identified, participated in the FT sessions. Questionnaire results indicated that 74% of spectators were satisfied with their experience and 70% considered this methodology a useful approach for other health issues. Gender, age, and profession did not influence satisfaction or utility scores. Participative strategies such as FT represent an innovative solution to increasing HCWs' awareness of the importance of flu vaccination and could positively impact their adherence to vaccination recommendations. FT can also be a meaningful HCW teaching tool for learning about and changing attitudes toward other clinic and public health issues.