This study was undertaken to examine group lifestyle therapy based on individual psychology and its impact on students’ procrastination and academic achievement. This is a semi-experimental research with pretest-posttest design and experimental and control groups. The population of the study comprised Darabi high school boys who were enrolled in 2011-2012 academic year and were referred to the Counseling Center of the Regional Department of Education. Random multi-stage sampling method was used and 24 students were selected and assigned to experimental and control groups (12 students in each group). The instrumentation included Schwarzer, Schmitz and Diehl’s Procrastination Scale and student’s GPAs. The experimental group received group lifestyle therapy based on individual psychology in eight weeks (one session per week); however, the control group received no intervention. Results of ANCOVA showed that group lifestyle therapy which is based on Adler’s individual psychology could decrease students’ procrastination and promote their academic achievement (p<0.01).