SAP MM (Materials Management) is a module in SAP ERP (Enterprise Resource Planning). Materials Management is a core supply chain function and includes the capabilities of supply chain planning and execution. Materials Management is what companies use to decide complete specifications for materials, the specifications for materials conveyed to procurement, and other sourcing functions.

Materials Management is also responsible for deciding the amount of material to be transported in the supply chain at each storage site, developing material replenishment plans, deciding the inventory levels to be kept for each category of product (raw material, finished goods) and transmitting material needs information within the extended supply.