Through decision B.BM-2021/17, the Board of the Green Climate Fund (GCF) launched the Second Performance Review (SPR) of the GCF, with the final report expected in early 2023. An early component of the SPR is this synthesis report, which presents a synthesis of previous IEU evaluations, GCF Secretariat documents and reports, and related external literature from the GCF-1 period (2020–2023).