As the market driven demand in optical and electro-optical industries heading towards smaller, lighter, and higher quality, more and more optical components with micrometer to sub-millimeter feature size are required to be machined to very good surface finish and high profile accuracy. Typical examples include: endoscope/capsule endoscope, surveillance camera, mini optical monitoring systems, smart phones and wearable devices. In comparison to plastic lenses, glass lenses have higher and more stable refraction index, higher transmissivity, better chemical/mechanical resistance and better environmental durability. This means that whenever high resolution and high quality images are required, glass lenses will be the better choice. This research aims to develop a feasible and effective process to fabricate sub-millimeter glass lenses. To carry out the precision micro-grinding of tungsten carbide (WC) mold for glass molding, resin bond diamond grinding wheels of various grit sizes are produced by mixing, coating and UV-curing. Those wheels are trued to 0.5 mm or less in diameter and used in precision slant grinding process. WC molds are successfully generated to a surface finish and profile accuracy better than 2 nm (Ra) and 0.12 μm (P-V) respectively. Glass lenses are molded by these WC molds to a surface finish and profile accuracy better than 10 nm (Ra) and 0.4 μm (P-V) respectively in this study. This shows that the fabrication processes developed in this study are feasible and can be used to produce sub-millimeter glass aspheric lenses effectively.