Hay Bridge

Hay Bridge may refer to:
 * Sennoy Bridge, Saint Petersburg, Russia
 * Hay-on-Wye Bridge, Powys, Wales
 * Hay's bridge an electric circuit for measurement.
 * Hay Bridge, a bridge over the Murrumbidgee River at Hay, N.S.W., Australia; both the modern concrete bridge and the former iron-lattice swing bridge (1873 to 1973).