Diego Martin is a town in northwestern Trinidad, just west of the capital Port-of-Spain. It is a densely populated area nestled in a valley of the Northern Range. It includes Petit Valley, Westmoorings and Diamond Vale. There are shopping centers,banks,stores and several secondary schools including local football powerhouse St. Anthony's College. Places to visit include the historical Waterwheel and the Blue Range waterfalls.
The town area is administered by the Diego Martin Regional Corporation.