The present study was conducted with the aim of investigating the role of the lifestyle of socially active mothers in the formation of teenagers' identity. The current research has been conducted using qualitative and phenomenological methods. The research population is mothers who have at least one social activity and are mothers of teenagers between 12 and 18 years old. Sampling has been done in a purposeful way. Participants in the research include 10 socially active mothers and 10 teenage daughters of these mothers. In order to answer the questions of identity formation, the teenage children of these mothers who were between 12 and 18 years old were also interviewed. The information was obtained from semi-structured in-depth interviews. Qualitative coding method was used to analyze the data. The results of data analysis on the role of socially active mothers' lifestyle in the formation of teenagers' identity led to the identification of 33 themes, which were categorized into six main themes. The six main themes are (1) characteristics of adolescent identity in relation to self (2) characteristics of adolescent identity in relation to family (3) characteristics of adolescent identity in relation to existence (4) educational identity (5) religious identity and 6) Social identity. The findings of this research can be useful and practical in the formation of the identity of adolescent girls who have socially active mothers.