An electrical connector backshell which is divided longitudinally into a pair of separable parts. The longitudinal edges of the two parts embody interlocking means allowing longitudinal sliding engagement of the parts, but preventing lateral separation of the parts even if one or both of the parts is flexed. The backshell housing may be formed from sheet metal. The two parts of the housing may be assembled over a cable after the conductors thereof have been connected to the contacts in a connector shell.