Powder injection molding represents an attractive technology for manufacturing micro components offering a remarkably wide range of materials. A survey will be given on current and future applications focused (but not limited to) on micro system technology products. Keywords, among others, are functional materials, magnetic metals, and ceramic matrix composites. Special topic will be the powder injection molding of high-entropy-alloys or compositionally complex alloys, respectively, which represent a quite new type of materials in metallurgical research. They are expected to offer unique material properties. The related interdependencies of alloy composition, atomization, injection molding parameters, sintering procedures, densities, and obtained microstructures will be evaluated. Recent results and examples will be presented.