Hollow-graphitized carbon nanospheres (CNS), also known as nanocapsules (CNC), with inner diameter of 20-50 nm and shell thickness of 10-15 nm were synthesized from resorcinol (R) and formaldehyde (F) polymerized in the presence of an iron polymeric complex (IPC). IPC acts as a dispersant for the formation of uniform R-F-Fe carbon precursor and provides iron catalyst/template for the formation of CNS. The uniform and narrow particle size (< 3 nm) of the IPC ensures reproducible synthesis of uniform final products with unique properties. The morphology and structure properties of the CNS have been characterized in detail. CNS is as a promising material for replacing carbon black in high-performance and weight-sensitive applications or for replacing CNT in cost-sensitive applications.