Meta-analysis of prevalence ratios (PRs) of human immunodeficiency virus (HIV) and 95% confidence intervals from research in prisons and closed settings published between January 2005 and July 2017 that compared men who have sex with men (MSM) with men who did not report engaging in same-sex acts. Articles lacking HIV prevalence information for either MSM or their counterparts who were not engaged in same-sex practices were excluded from PR estimates.