Vicarious learning helps small and medium-sized enterprises (SMEs) acquire foreign market knowledge by observing and interpreting other firms’ actions and outcomes in international markets. We searched Scopus, ProQuest, and EBSCOhost (2000–2025) and retained 27 studies (2007–2025). The synthesis organizes prior studies into four analytically derived categories that summarize how vicarious learning is conceptualized and operationalized in SME internationalization research: (T1) peer performance benchmarking, (T2) imitation and leader-following, (T3) institutional mimetic pressures, and (T4) network-, cluster-, and advisor-enabled vicarious learning. Across themes, a subset of studies suggests that absorptive capacity may condition whether external experience is recognized, assimilated, and exploited, although direct tests remain uneven and in some cases the contingency is inferred rather than explicitly tested. We translate these insights into an organizing framework and a future agenda on boundary conditions, measurement, and multi-level designs, positioning the review as mechanism clarification that imposes conceptual order on a fragmented literature, rather than as field-level consolidation.