A staffing supplier that takes overall responsibility for providing clients with temporary staff. In a master supplier relationship, all orders will usually go first to the master supplier to either be filled or distributed to secondary suppliers. Sometimes a master supplier will not only provide a significant portion of the temporary staff working at the employer’s site but also manage an organization’s contingent workforce program. Also known as Master Vendor. Master Supplier can be an alternative to a Vendor Neutral MSP or Contingent RPO model. (See also: See also and Contingent RPO, Vendor Neutral, and Vendor on Premises.)