This volume contains the proceedings of the international conference of Various Aspects of Multiple Zeta Functions, in honour of Professor Kohji Matsumoto’s 60th birthday, held at Nagoya University, Japan, from August 21–25, 2017.

This volume consists of 15 research papers on various recent topics about multiple zeta-func­tions, which include not only multivariate cases but also single-variable cases, additive and multiplicative number theory, as well as poly-Bernoulli numbers and polynomials.

The editors believe that this volume represents the major part of the contributions presented in the conference and hope that the volume is useful for all researchers and students who are interested in this fruitful research field.