Abstract: A toilet roll dispenser primarily for use in portable toilets, comprising a housing having a first toilet paper roll supported on a mandrel in position for use, and a second or reserve toilet paper roll on the mandrel in side-by-side relationship. The reserve roll is received in the cavity of a use-prevention receptacle which is also supported on the mandrel in co-axial relationship with the reserve toilet paper roll. The side walls of the housing restrict lateral movement of the toilet paper rolls so the reserve toilet paper roll cannot be moved laterally out of the use-prevention receptacle until the first toilet paper roll has been used up and its paper core removed from the mandrel. While the reserve roll is in the cavity of the use-prevention receptacle it cannot be used. After the first roll has been completely used up, it is then possible to reach the paper core of the used up first roll and tear it away from the mandrel.