Psychological well-being is one of the important components of mental health in the elderly, and it is important to study the factor affecting on it. This research was conducted to investigate the relationship between amnesty, gratitude and humility with the mental well-being of the elderly. The study was a descriptive one. Among the elderly in two districts of Ahwaz, 103 people were selected by available sampling method. All elderly people completed the amnesty, gratitude, humility and psychological well-being questionnaires. Data was analyzed by Pearson correlation and multiple regression with stepwise model. The results showed that amnesty, gratitude and humility had a positive and significant relationship with well being in the elderly people. Amnesty, gratitude and humility predicted 30.5% of the changes in mental well-being in the elderly. Amnesty had the strongest role in predicting well-being in the elderly. According to the results of amnesty, gratitude and humility, respectively, had a significant role in predicting mental well-being of the elderly. Therefore, it can be suggested that attention be paid in improving the psychological well-being of the elderly, along with common psychological treatments, amnesty, gratitude and humility