Alcohol and other drug use disorder (AOD) among adolescents stunts the developing brain, hampers academic and job skills training, impairs positive social bonds, and results in lower quality of life, higher burden of disease, and premature mortality. The process of AOD recovery is difficult for adolescents and often involves multiple returns to use and subsequent rounds of treatment (Buckheit et al., 2018). Recovery capital is the total set of resources one can use to initiate and sustain recovery and is comprised of four major domains – human, financial, social, and community resources (Cloud & Granfield, 2001, 2008; Granfield & Cloud, 1999; Hennessy, 2017). Social recovery capital (e.g., sober friends, family, and peer groups) is vital to reducing substance use, especially for adolescents (Brown et al., 1989; Ramo et al., 2012). Social contexts shape social identity – who I am – which is generated from social group membership – who we are (Jetten et al., 2014). Social identity develops through interaction with social groups and changes over time as adolescents develop and engage with different social groups (Best et al., 2016; Haslam et al., 2017, 2018; Kay, 2018). As peer norms and values are strong influences on adolescent health and risk behaviors, one’s social identity is an important determinant of actual behaviors in social contexts. AOD recovery becomes more or less difficult depending on social influences; yet, the degree to which social influences affect the development of recovery capital and substance use outcomes has not yet been empirically examined among adolescents. Furthermore, how can social network processes be leveraged to improve the adolescent recovery process? Social Identity Mapping (SIM) is one novel approach to address this question (Beckwith et al., 2019; Best et al., 2016, 2018; Cruwys et al., 2016). SIM uses a series of structured questions to create a visual map of one’s social identity by collecting data on the relative importance of social groups to the individual and examining recovery support and substance use patterns among these groups. However, SIM has primarily been used with adult populations and has been only examined with younger populations in a few instances (Mawson et al., 2015). Our pilot study (also registered on OSF: DOI 10.17605/OSF.IO/8VDCP) worked to ensure the SIM was feasible and acceptable to youth by enrolling up to 35 youth to complete a study visit with the SIM and a follow-up interview. Necessary changes to the SIM approach, including facilitator instructions and key variables to collect, were noted and will be incorporated into this longitudinal study. Given the COVID-19 pandemic, all study visits for the pilot were conducted remotely, and we plan to use a hybrid approach of some in-person and some remote study visits for this longitudinal study. This study will now seek to examine relationships between the SIM, recovery capital, and other key factors among adolescents seeking treatment for a substance use disorder and how these relationships change over a 12-month period.