The NCI CBIIT instance of caNanoLab is a nanoparticle annotation and data-sharing portal that provides researchers with data relating to the characterization of nanoparticle samples, protocols involving nanoparticles, and associated publications. It was developed for the NCI Nano Alliance, part of the NCI Center for Strategic Scientific Initiatives. The portal contains data describing a total of 989 samples of 17 distinct nanomaterial entities: biopolymers, carbon black particles, carbon nanotubes, carbon particles, dendrimers, emulsions, fullerenes, liposomes, metal oxides, metal particles, metalloids, nanohorns, nanorods, nanoshells, polymers, quantum dots, and silica particles. Sample characterizations include these information elements: