Rio, Anna
- Universitat Politècnica de Catalunya. Galois representations, elliptic curves, modular forms.
- http://www-ma2.upc.edu/~rio/

Rubin, Karl
- University of California, Irvine. Arithmetic algebraic geometry. Publications, lecture notes.
- http://math.uci.edu/~krubin/

Ramakrishnan, B.
- Harish-Chandra Research Institute. Number theory and automorphic forms.
- http://www.mri.ernet.in/math/ramki

Rouse, Jeremy
- University of Wisconsin-Madison. Number theory, with particular interest in elliptic curves and modular forms; Combinatorics. Publications.
- http://www.math.wisc.edu/~rouse/

Rubinstein, Michael
- University of Waterloo. Experimental number theory. Publications, software for L-functions, tables of modular polynomials.
- http://www.math.uwaterloo.ca/~mrubinst/

Rose, Harvey
- University of Bristol. Problems concerning small classes of recursive functions; Number theory of elliptic curves. Publications, teaching material.
- http://www.maths.bris.ac.uk/~maher/

Rohrlich, David
- Boston University. Number theory. Preprints, errata.
- http://math.bu.edu/people/rohrlich/

Rudnick, Zeev
- Tel-Aviv University. Number theory; quantum chaos.
- http://www.math.tau.ac.il/~rudnick/

Richert, Hans-Egon
- Obituary from Universitaet Ulm.
- http://www.mathematik.uni-ulm.de/fak/presse/richert.html.en

Robinson, Margaret M.
- Mount Holyoke. Igusa local zeta functions.
- http://www.mtholyoke.edu/~robinson/