Metals are involved in various research fields of chemistry where they play key roles, as illustrated for example in transition-metal homogeneous catalysis, materials for energy storage and conversion, luminescent materials, and coordination-driven self-assembly. This special collection of Chemistry – An Asian Journal features significant contributions that chemists around the world make in this area. Working together with Professors Pierre Braunstein, Chi-Ming Che, Guo-Xin Jin, Fuwei Li and Yun Zong, Chemistry – An Asian Journal assembled 56 excellent contributions in this special collection to celebrate the 65th birthday of Prof. Andy Hor (A*STAR, Singapore).