21st Engineer Regiment, Royal Engineers

21 Engineer Regiment RE is a regiment of the British Army's Royal Engineers. It is based at Claro Barracks, Ripon, Catterick Garrison in Yorkshire.

Today it consists of:
 * 7 Headquarters and Support Squadron
 * 1 Field Squadron Squadron
 * 4 Field Squadron Squadron
 * 103 Field Squadron (Army Reserve)
 * 106 Field Squadron (Army Reserve)
 * Royal Electrical and Mechanical Engineers Light Aid Detachment