This study reviews all the academic contributions to research on social impact bonds (SIBs). It responds to the need for clarification across and within the various perspectives used in the literature. The goal was to assess the approaches used in extant studies and to offer directions for future studies. A bibliometric analysis was performed, and a framework was developed in which the contributions were positioned according to two criteria: (a) a distinction on the basis of research approaches and perspectives on SIBs and (b) an analysis of content according to a protocol that includes key questions corresponding with the most pressing issues in this area. K E Y W O R D S literature review, social impact bond, social impact finance 1 | INTRODUCTION The purpose of this study is to provide a systematic review of the academic literature on social impact bonds (SIBs). Since their introduction in the United Kingdom in 2010, SIBs have been receiving increasing attention from practitioners and scholars, as evidenced in the nuanced approaches and methods adopted for studying them as well as in the diverse research areas where SIBs have been addressed (Fraser, Tan, Lagarde, & Mays, 2018). To date, a review of SIBs focussed exclusively on academic papers is non-existent. Fraser et al.'s (2018) review included both academic (38 papers) and "grey" literature products (63 papers) from 2009 to 2015. They distinguished the "cautionary narrative" (mainly related to the academic literature) and two other narratives (mainly related to the grey literature) that assumed a pragmatic and ideological perspective of SIBs. At present, SIBs have broadened both in terms of adoption and research interest: This could allow academics to develop both theoretical and empirical analyses. Therefore, exclusive focus on academic contributions is timely because it is possible to reconstruct a scholarly assessment of SIB implementations, theoretical so-far developing arguments, and open issues. The review's strategy was twofold. First, a bibliometric analysis was conducted to explore (a) the evolution of SIBs in the literature; (b) the existence of central contributors and institutions devoted to work on SIBs; (c) disciplinary areas (research categories) that have shown interest in the discourse of SIBs; and (d) the visibility of contributions as measured through their positioning in ranked journals. Second, to develop a framework, academic contributions to SIBs were analysed and positioned according to two criteria: (a) a distinction based on research approaches to and perspectives on SIBs and (b) an analysis of content according to a protocol that includes key questions corresponding to SIBs' most pressing issues as individuated by the Government Outcomes Lab, a centre of academic research and practice for outcome-based contracting and SIBs at the University of Oxford. The current paper makes two contributions. First, it provides a critical analysis of academic contributions that point out directions and frameworks for extant research and future r...