This paper describes the realisation and operation of a magnetostatic volume wave (MSVW) delay line utilizing an epitaxial YIG film which exhibits useful constant delay characteristics. The delay line comprises a normally magnetized YIG film which is separated from a ground plane by a dielectric layer. Experimental results have been obtained using a 4.5 μm thick LPE‐grown YIG film and a 115 μm thick glass dielectric layer, with 30 μm wide and 3 mm long Al microstrip lines deposited on the latter to form input and output couplers. The device has exhibited, in agreement with theory, a constant delay of about 350 nsec over a 200 MHz bandwidth in the 1 GHz to 5 GHz frequency range.