SAP R/3是一套知名的企业资源规划（Enterprise Resource Planning，简称：ERP）软件，由德国SAP公司所研创，2005年此软件的更名为mySAP ERP。至今（2007）, SAP R/3的客户仍享有更新和维护，最新的版本为R/3 Enterprise 4.70 Extension Set 2.00. SAP R/3是为客户服务设计的。R指的是实时数据处理（realtime data processing），而3表示组成R/3系统的三层（见下文）. SAP R/3的前身SAP R/2服务大型计算设备的使用。最早发明于1973年的RF进程，也称为SAP R/1现在用于计算机支持的会计核算。

SAP R/3 is the former name of the enterprise resource planning software produced by the German corporation SAP AG (now SAP SE). It is an enterprise-wide information system designed to coordinate all the resources, information, and activities needed to complete business processes such as order fulfillment, billing, human resource management, and production planning.