Perham Down is a village in Wiltshire, England, near Ludgershall and Tidworth. It is on the edge of Salisbury Plain about 6 miles (10 km) northwest of Andover, Hampshire and is often referred to by locals as Perham. The village is in Tidworth civil parish and lies about 1 1⁄2 miles (2.4 km) east of the town of Tidworth.