Objective: To examine the results of prison privatization. Method: In an effort to provide an empirical base from which decisions about privatization might be made, we conducted a meta-analysis of reports on head-to-head comparisons between an identifiable privately managed and publicly managed prison(s). Results: Our search identified 12 studies. Indicators of cost of confinement and confinement quality were assessed. Results suggest privately managed prisons provide no clear benefit or detriment. Conclusion: Cost savings from privatizing prisons are not guaranteed and appear minimal. Quality of confinement is similar across privately and publicly managed systems, with publicly managed prisons delivering slightly better skills training and having slightly fewer inmate grievances. (Contains 3 tables.)