This report examines the effect of a primary component of restorative justice (RJ) programming in one community-based organization (CBO) on students' behavioral and disciplinary outcomes in four Chicago high schools from 2014 to 2016. It looks at the effect of students' use of RJ programs offered in the CBO's "Peace Room" (PR) on rates of disciplinary infractions, in-school suspensions (ISS) and out-of-school suspensions (OSS). Data on student utilization of the PR compiled by the CBO staff were linked with data on student disciplinary infractions and suspensions obtained from Chicago Public Schools. Propensity score matching was used to compare outcomes of students who had one or more infractions and utilized the PR to similar students who attended the same four high schools prior to the implementation of the PR. Results found that the percentage of PR participants who had one or more misconducts and received OSS was 30 percentage points lower than the percentage for students in the comparison group. Specifically, 43 percent of the former received OSS versus 73 percent of the latter. Students who had one or more incidents of misconduct and utilized the PR experienced about 4 fewer days of OSS than students in the comparison group. [This study was funded by the Pritzker Pucker Family Foundation.]