A fluid dispenser for dispensing a metered volume of a fluid product having a storage chamber for storing the fluid product, a dispensing outlet through which the fluid product is dispensable from the dispenser, a metering chamber having an outlet which places the metering chamber in fluid communication with the dispensing outlet; a plurality of transfer openings through which the fluid product is transferable between the storage and metering chambers; and a boundary wall structure which is cyclically movable between a first configuration, in which the transfer openings are open, and a second configuration, in which the transfer openings are closed is described.