OBJECTIVE:To describe pharmacy-supported transition-of-care (TOC) interventions and determine their effect on 30-day all-cause readmissions. DATA SOURCES:MEDLINE/PubMed, EMBASE, International Pharmaceutical Abstracts, ABI Inform Complete, PsychINFO, Web of Science, Academic Search Complete, CINHAL, Cochrane library, OIASTER, ProQuest Dissertations & Theses, ClinicalTrials.gov , and relevant websites were searched from January 1, 1995, to December 31, 2015. STUDY SELECTION AND DATA EXTRACTION:PICOS+E criteria were utilized. Eligible studies reported pharmacy-supported TOC interventions compared with usual care in adult patients discharged to home within the United States. Studies were required to evaluate postdischarge outcomes (eg, rate of readmissions, hospital utilization). Randomized controlled trials, cohort studies, or controlled before-and-after studies were included. Two reviewers independently extracted data and evaluated study quality. DATA SYNTHESIS:A total of 56 articles were included in the systematic review (n = 61 858), of which 32 reported 30-day all-cause readmissions and were included in the meta-analysis. A taxonomy was developed to categorize targeted patients, intervention types, and pharmacy personnel as sole intervener. The meta-analysis demonstrated about a 32% reduction in the odds of readmission (odds ratio [OR] = 0.68; 95% CI = 0.61 to 0.75) observed for pharmacy-supported TOC interventions compared with usual care. Heterogeneity was identified ( I2 = 55%; P < 0.001). A stratified meta-analysis showed that interventions with patient-centered follow-up reduced 30-day readmissions relative to studies without follow-up (OR = 0.70; CI = 0.63 to 0.78). CONCLUSIONS:Pharmacy-supported TOC programs were associated with a significant reduction in the odds of 30-day readmissions.