Illogan (pronounced i'lluggan) is a village and parish in Cornwall, United Kingdom. It is two miles (3 km) northwest of Redruth and had a population of 5585 in the 2001 census.

Originally a rural area supporting itself by farming and agriculture, Illogan shared in the general prosperity brought about by the 19th century mining boom, which was experienced by the whole Camborne-Redruth area.

The church is dedicated to Saint Illogan, of whom little is known. Illogan was the birthplace of engineer and inventor Richard Trevithick.