Unlike ordinary linear polymers, dendritic architecture is unique in the terms of its elaborative ca- pability for total control over molecular design parameters at the single molecular level, i.e., molecular size, branching pattern, structure, and morphology, thereby provides a new platform for the creation of functional materials with nano- meter-scale precision. This review mainly concerns recent works on the development of dendritic nanomaterials with a focus on photo- and spin-related functionalities. Strategy for the incorporation of chromophores to build up light-har- vesting antennae is presented with an emphasis on morphology and size effects. Dendritic macromolecules for photo- induced electron transfer are categorized based on chromophores that serve as the active center to absorb light and trig- ger photochemical process. In this context, dendrimers bearing porphyrin, conjugated polymer, and fullerene for realization of long-lived charge-separation state and light energy conversion are highlighted. On the other hand, design of dendritic macromolecules for spin-functional materials is focused on dendronized organic radicals and dendritic co- ordination polymers. Especially, spin-functional soft materials with an aim for spin manipulation and novel magnetic- optical switches are emphasized. (doi:10.1295/polymj.PJ2007006)