Katsunori Wakabayashi (若林 克法, Wakabayashi Katsunori) is a physicist at the International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan.

He is an authority and leading researcher in nanotechnology in the area of energy states of single wall carbon nanotubes (SWCN).

His research is notable for the edge effects of the nanographene materials, which is a part of the single layer graphene.

From 2000 to 2009 he was an assistant professor at Department of Quantum Matter in Hiroshima University, Japan.

[1] He has been awarded the commendation of ministry of education, culture, sports, science and technology (MEXT), Japan in 2010 for the contribution of pioneering works on theoretical research of nanoscale effect on electronic properties of graphene.