The East Riding (Fortress) Royal Engineers was a volunteer unit of Britain's Royal Engineers formed for the defence of the Humber Estuary in the East Riding of Yorkshire. As well as serving in this role it also provided field and specialist engineer units in both World Wars. Its successors continued to serve in the Territorial Army until 1991.

The 2nd East Riding Artillery Volunteers was a part-time unit of Britain's Royal Artillery based at Hull and along the Humber Estuary. Its successor units provided field artillery on the Western Front during World War I and air defence artillery during and after World War II. Latterly it formed part of the Humber Artillery based at Hull.