Classroom management is commonly challenging in middle schools. Class-wide function-related intervention teams (CW-FIT) is a multi-tiered intervention designed to decrease problem behaviors at the classroom level. It is comprised of evidence-based practices such as teaching classroom expectations, increasing teacher praise, and using positive reinforcement in an interdependent group contingency. CW-FIT has shown promise in a variety of school settings, but it has not been tested in middle school art classrooms. This initial investigation examined the effects of CW-FIT using a single-subject ABAB design in two middle school art classrooms. Results indicated that class on-task behavior increased by more than 25% and teacher praise-to-reprimand ratios more than doubled during CW-FIT implementation compared to baseline levels. Results also indicated that on-task behavior for students identified as at risk for behavioral disorders improved by more than 18% during the intervention. Teachers and students found the intervention to be socially valid. Resulting implications were promising for using CW-FIT in other middle school art classrooms. [This paper was published in "Journal of Positive Behavior Interventions" v22 n1 p38-50 2020 (EJ1235752).]