AimThe present study aimed to determine the impact of group integrative reminiscence therapy on mental health of older women living in Iranian nursing home in 2016.DesignA quasi‐experimental design pre‐ and post‐test was used in the present study. Purposive sampling was used to recruit participants who met the study criteria.MethodThe statistical population included 60 older women living in nursing home, among whom 46 having the inclusion criteria were selected as the sample. After completing the Goldberg's General Health Questionnaire, the older people were divided into intervention (N = 23) and control (N = 23) group by using block randomization method. The intervention groups were trained by integrative reminiscence therapy for 60–90 min 10 sessions, twice a week. Descriptive statistics and ANOVA were used for data analysis by SPSS software.ResultsThe results indicated that group integrative reminiscence therapy significantly affected general mental health and physical dimensions, anxiety and insomnia, social functions and depression.