The main purpose of this research is to identify the relationship between forgiveness tendency, revenge intention and mental health, and the effects of forgiveness tendency and revenge intention on mental health of employees. This research was conducted in Kayseri and Yalova with 290 participants from various government and private organizations. The results pointed to a significant and positive relationship between forgiving other people and situations with mental health. Additionally, there was a significant negative relationship between revenge intention and mental health. The results of regression analysis indicated that revenge intention had a significant negative effect on mental health, while the relationship of forgiveness tendency positively and significantly affected mental health. Employee's mental health was found to be better than managers. The employee's revenge intention was lower than managers. Forgiveness tendency of married people was higher than singles, while the mental health of singles was better than married people.