金属射出成型（英语：Metal Injection Molding，缩写MIM）或称「粉末射出成型」（Powder Injection Molding）、「陶瓷射出成型」（Ceramic Injection Molding），乃结合塑胶射出成型、高分子聚合物化学、粉末冶金技术及金属材料科学的革命性技术，由美国加州ParmaTech公司于1973年发表。其技术利用超微金属粉末与结合剂， 经过混合、混炼、加热及造粒等工程制成射出成型原料，具流动性，透过高精密特制模具（射出机）成型为生胚，再经脱腊脂、烧结等进程，或自动化快速制造高密度、高精度且形状复杂的金属零件，具减少传统金属加工的进程与成本之优点。最后依照产品功能及规格需求，必要时进行第2加工，例如热处理、表面处理等。1973年发表后，只看到成果，如何做出成品，仍待研究，俟1990年代纽约伦斯勒理工学院（RPI）粉末射出学教授兰德尔·M·吉门（Randall M. German）主持一个大型产学计划，研究将金属、陶瓷粉末与传统的塑胶射出技术结合，形成制造技术。

Metal injection molding (MIM) is a metalworking process by which finely-powdered metal is mixed with a measured amount of binder material to comprise a "feedstock" capable of being handled by plastic processing equipment through a process known as injection mold forming. The moulding process allows complex parts to be shaped in a single operation and in high volume. End products are commonly component items used in various industries and applications. The nature of MIM feedstock flow is defined by a physics called rheology. Current equipment capability requires processing to stay limited to products that can be molded using typical volumes of 100 grams or less per "shot" into the mold. Rheology does allow this "shot" to be distributed into multiple cavities, thus becoming cost-effective for small, intricate, high-volume products which would otherwise be quite expensive to produce by alternate or classic methods. The variety of metals capable of implementation within MIM feedstock are referred to as powder metallurgy, and these contain the same alloying constituents found in industry standards for common and exotic metal applications. Subsequent conditioning operations are performed on the molded shape, where the binder material is removed and the metal particles are coalesced into the desired state for the metal alloy.