The Glamorgan Fortress Royal Engineers was a Welsh Territorial Army (TA) unit of Britain's Royal Engineers, first raised in 1885 as a Volunteer unit of Submarine Miners to defend the Severn Estuary. During World War I it carried out defence work in England and Gibraltar, and detachments served on the Western Front. In World War II it served in the North African campaign, including the Second Battle of El Alamein, and the Allied invasion of Sicily. Postwar, the unit continued in the TA until 1961.