This chapter describes ellipsis phenomena in Indonesian (Austronesian; Malayo-Polynesian). Several ellipsis phenomena are attested in Indonesian, including sluicing, fragments, auxiliary-stranding verb phrase ellipsis, pseudogapping, gapping, stripping, conjunction reduction, null complement anaphora, and ellipsis within nominal phrases. Indonesian has the potential to contribute meaningfully to our understanding of the ways in which these phenomena manifest cross-linguistically. One notable feature of Indonesian ellipsis, which is considered in detail, is that it permits prepositions to be omitted in some elliptical contexts, despite preposition stranding being prohibited in non-elliptical contexts. This is unexpected, given the cross-linguistically robust Preposition Stranding Generalization (Merchant 2001), which links a language’s ability to omit a preposition under ellipsis to its ability to strand a preposition via extraction of its complement. Phenomena affected include sluicing, fragments, pseudogapping, stripping, and gapping.