A historical introduction -- Theoretical studies on gold clusters and nanoparticles -- Gold Nanoclusters: Size-Controlled Synthesis and Crystal Structures -- Progress in the Synthesis and Characterization of Gold Nanoclusters -- Structural aspects of phosphine-coordinated ultrasmall gold clusters: the next generation -- Structure & Bonding in the Metal-Rich Gold-Thiolate Cluster Compounds -- Gold nano-alloys -- Model catalysts based on Au clusters and nano particles -- Gold clusters in the gas phase -- Gas phase formation, structure and reactivity of gold cluster ions.