Zudilin, Wadim - Max Planck Institute for Mathematics (on leave from Moscow State University). Zeta functions. - http://wain.mi.ras.ru
Ziegler, Volker - TU Graz. Diophantine equations, especially Thue equations. Publications. - http://finanz.math.tu-graz.ac.at/~ziegler/
Zhu, Hui June - SUNY at Buffalo, NY. Arithmetic geometry. Publications. - http://www.math.buffalo.edu/~hjzhu/
Zhao, Liangyi - University of Toronto. Exponential sums, character sums, L-functions and automorphic forms. Publications. - http://www.math.toronto.edu/lzhao/
Zimmermann, Paul - INRIA Lorraine. Computer algebra, the arithmetic of Big Numbers, random generation of combinatorial structures and reliable computation. - http://www.loria.fr/~zimmerma/
Zhang Shou-Wu - Columbia University. Arithmetic algebraic geometry. - http://www.math.columbia.edu/~szhang/
Zuniga-Galindo, Wilson - Barry University. Algebraic geometry, number theory, p-adic analysis. - http://euclid.barry.edu/~zuniga/
Zaccagnini, Alessandro - University of Parma. Analytic Number Theory. - http://www.math.unipr.it/~zaccagni/home.html