3D free-standing and embedded metallic structures with a height of 100 mum (see Figure and also cover) have been microfabricated and characterized. Polymer nanocomposites containing metal nanoparticles, a metal salt, and an appropriate photoreducing dye are found to be efficient precursors for direct laser writing of continuous metal structures. The authors offer a versatile new approach to the 2D and 3D patterning of metals on different length scales. [GRAPHICS] Laser and Electron-Beam Induced Growth of Nanoparticles for 2D and 3D Metal Patterning.