Triangle is a village in the Calderdale borough of West Yorkshire, England. It is located in the valley of the River Ryburn, on the A58 road over the South Pennines, between Sowerby Bridge and Ripponden. Historically a part of the West Riding of Yorkshire, it dates mainly from the 19th century period of industrialisation but was here for some time prior. The name of the village derives from the patch of ground formed when the old road parted with the newer toll road to Rochdale.