A washing machine appliance includes a nozzle assembly for providing wash fluid to a tub of the washing machine appliance. The nozzle assembly includes an extendable nozzle mounted on the end of a retractable fluid supply conduit such as a telescoping arm or a folding arm. The retractable fluid supply conduit is movable for positioning the extendable nozzle in a retracted position and an extended position. The retractable fluid supply conduit is fluidly coupled to a valve assembly on the back of the washing machine appliance such that a user may extend the extendable nozzle to perform pretreating operations or otherwise selectively supply wash fluid to the tub.