The study aims to examine the effect of work engagement as a mediator on transformational leadership and challenge stressors with turnover intention. The study was conducted on 79 permanent employees working in all branch offices in one of the non formal education institutions spread in Jakarta, West Java, Central Java and East Java. The results showed that work engagement has influence as a mediator between transformational leadership and challenge stressors to turnover intention. The results also show that work engagement has the most significant role to increase the influence of transformational leadership on turnover intention because it has the greatest total effect value.