This data set shows Roundtable on Sustainable Palm Oil (RSPO)-certified grower supply bases in Indonesia, though supply bases digitized by the RSPO are not available for download. A supply base consists of all lands that produce or support the production of palm oil processed at an RSPO-certified mill, and may include planted palm, nurseries, riparian buffers, HCV set-asides, palm oil mills and supporting infrastructure, certified smallholder oil palm lands, and roads. The data providers first compiled a list of all grower and group certifications conferred by the RSPO. As of March 30, 2017, about 400 palm oil mills and 20 smallholders’ groups had been certified by the RSPO globally. Polygons were digitized from maps available from audit reports hosted on the RSPO website, supplemented by spatial data on plantation boundaries provided by companies as part of the 2014 RSPO Annual Communication of Parties (ACOP), as well as plantations identified from Greenpeace and Sawit Watch concession data sets. Ancillary information was collected from audit reports including the dates of RSPO certification and letters of intent notifying stakeholders of the intent to pursue RSPO certification. The data were subset to plantations within Indonesia.