Collated dataset of all the available friction measurements of samples, up to June 2025, from Nankai Trough, off the southern coast of Japan, North Pacific Ocean. These measurements include frictional strength and rate and state parameters. It also contains mineralogical information, where the samples have been referenced back to ocean drilling expeditions, where the XRD methodology was consistent. The data were collated from published datasets produced by various ocean drilling programs, Deep Sea Drilling Project (DSDP), Ocean Drilling Program (ODP), Integrated Ocean Drilling Program (IODP) and International Ocean Discovery Program (IODP). The data supports the paper: D. R. Faulkner, J. Zhang, H. Okuda, J. D. Bedford, M. J. Ikari, A. M. Schleicher, and T. Hirose. Synthesis of the Laboratory Frictional Properties of a Major Shallow Subduction Zone: the Nankai Trough, Offshore SW Japan. Journal of Geophysical Research