In this review, I describe what is known about the solid-state chemistry of inorganic metal thiocyanates. It presents a systematic overview of their structures and highlights opportunities for developing their chemistry further. The very extensive chemistry of thiocyanate in solution or with co-ligands has been excluded as it is well-covered elsewhere. The review summarizes the chemistry of the binary M(NCS) x for every non-radioactive metal, and the structure of every ternary metal thiocyanate MM ' (NCS) x . Special attention has been paid to the structural analogies between metal thiocyanates and other inorganic solid-state compounds. I have relied, in addition to the primary literature, on two book chapters: Golub, Köhler and Skopenko (1986) and Williams (1948), which are the most comprehensive summaries of metal thiocyanate chemistry thus far published. The review begins with a general overview of metal thiocyanates highlighting characteristic trends. It then moves onto a description of the chemistry of binary metal thiocyanates, describing first the five structural families before summarising what is known about the binary metal thiocyanates without reported crystal structures. The structures of the ternary metal thiocyanates are then described, being classified first by framework dimensionality and then by characteristic structural features. The review concludes with a brief summary and prospectus of the potential of inorganic metal thiocyanate chemistry.