Castle Dore is an Iron Age hill fort (ringfort) near Fowey in Cornwall, United Kingdom located at grid reference SX103548. It was probably occupied from the 5th or 4th centuries BC until the 1st century BC. It consists of two ditches surrounding a circular area 79 metres (259 ft) in diameter. Excavated in the 1930s, it is one of the most intensively investigated Iron Age hillforts in Cornwall.