This review is concerned solely with main-group and transition metal compounds incorporating D n siloxy fragments of the type: O(R 2 SiO) n . Various reported routes to these metallasiloxane compounds from a range of ligand sources are discussed. Reactions involving siloxanolate ligand transfer with oligomerisation are featured. General structural and spectroscopic features of the compounds are outlined. A summary of reported chemistry for these metallasiloxane compounds is included. Selected information relating to the synthesis, structure and structural parameters of compounds is provided in tables organised according to periodic groups.