The structure of the metamorphic rocks forming the Southern Alps in South Westland, New Zealand, is described. Metamorphic grade increases north-westwards from greywacke and argillite east of the Main Divide through Chlorite Zone schists to high-grade schists and gneisses of the Biotite, Garnet, and Oligoclase Zones. The metamorphic zonal sequence is interrupted and repeated by post-metamorphic strike faults and folds, and terminated on the north-west by the Alpine Fault.