© 2015 Elsevier Ltd. Heavy drinking during adolescence is associated with increased reactivity to alcohol related stimuli and to differential neural development. Alcohol cue reactivity has been widely studied among adults with alcohol use disorders, but little is known about the neural substrates of cue reactivity in adolescent drinkers. The current study aimed to identify changes in blood-oxygen level dependent (BOLD) signal during a cue reactivity task pre- and post-monitored abstinence from alcohol. Method: Demographically matched adolescents (16.0-18.9. years, 54% female) with histories of heavy episodic drinking (HD; n= 22) and light or non-drinking control teens (CON; n= 16) were recruited to participate in a month-long study. All participants completed a functional Magnetic Resonance Imaging (fMRI) scan with an alcohol cue reactivity task and substance use assessments at baseline and after 28. days of monitored abstinence from alcohol and drugs (i.e., urine toxicology testing every 48-72. h). Repeated-measure analysis of variance (ANOVA) examined main effects of group, time, and group. ×. time interactions on BOLD signal response in regions of interest defined by functional differences at baseline. Results: The HD group exhibited greater (p