| Cai, Jin-Yi: University of Wisconsin, Madison. Contains curriculum vitae and recent research papers in postscript and pdf format. |
| Caldwell, Chris: University of Tennessee at Martin. Number theory, especially primality conditions. Prime pages, links and other resources. |
| Calegari, Frank: Harvard University. Includes publications, work in progress, and mathematical links. |
| Calkin, Neil: Associate professor at Clemson University, with interests in combinatorial and probabilistic methods, particularly in number theory. |
| Campbell, Garikai: Swarthmore College. List of links to selected papers, lectures, and professional mathematics organizations. |
| Campbell, Geoff: Researcher at LaTrobe University, Australia, with over two dozen research papers in number theory. |
| Cardon, David: Brigham Young University, Provo, Utah. Contains curriculum vitae with a list of publications and conferences attented. |
| Carls, Robert: University of Sydney. p-adic methods for the computation of zeta functions of varieties over finite fields. Publications. |
| Casselman, Bill: Automorphic forms, the representation theory of Coxeter groups and reductive groups over non-Archimedian local fields. |
| Chahal, Jasbir S.: Brigham Young University. Contact information. |
| Chai, Ching-Li: University of Pennsylvania. Arithmetic algebraic geometry. |
| Chakraborty, Kalyan: Harish-Chandra Research Institute. Contact information. |
| Chan, Heng Huat: National University of Singapore. Analytic number theory, basic hypergeometric series, elliptic functions, modular forms and modular equations, applications of modular equations, Ramanujan. |
| Chan, Tsz Ho: Case Western Reserve University. Analytic number theory: distribution of primes and pair correlation of zeros of the Riemann zeta function; elementary and combinatorial number theory. |
| Chang, Mu-Ling: University of Wisconsin-Platteville. Algebraic number theory and algebra. |
| Chang, Sungkong: Armstrong Atlantic State University. Arithmetic of elliptic curves; arithmetic of Jacobian varieties/abelian varieties; modular curves; theory of complex multiplication; algebraic number theory. Thesis, publications. |
| Chapman, Robin: University of Exeter. Number theory, algebra, combinatorics and problem solving. Papers, lecture notes and survey articles. |
| Charles, Denis Xavier: University of Wisconsin-Madison. Computational number theory. |
| Chen, Imin: Simon Fraser University. elliptic curves, Galois representations, automorphic forms. |
| Chen, William: Macquarie University. The theory of irregularities of point distribution. |
| Chi, Wen-Chen: National Taiwan Normal University. Number theory, Arithmetic algebraic geometry. |
| Childs, Lindsay: SUNY Albany. Algebra and number theory, especially relative Galois module theory. |
| Chinburg, Ted: University of Pennsylvania. Number theory, arithmetic geometry. |
| Chinta, Gautam: Brown University. Number theory, automorphic forms, L-functions. |
| Choi, Kwok Kwong Stephen: Simon Fraser University. Diophantine analysis. |
| Choie, YoungJu: Pohang University of Science and Technology. Arithmetic of modular forms. List of publications, Korean/English. |
| Chudnovsky Brothers: "The Mountains of PI", a New Yorker article by Richard Preston. |
| Clark, David: Brigham Young University. Contact information. |
| Clarke, Francis: University of Wales Swansea. K-theory, Bernoulli numbers, Stirling numbers. |
| Coates, John H.: University of Cambridge. Interests in number theory, arithmetical algebraic geometry, and Iwasawa theory. |
| Cobelli, Cristian: Institute of Mathematics of the Romanian Academy. Analytic number theory. Publications. |
| Cochrane, Todd: Kansas State University. Exponential sums. |
| Cogdell, James: Ohio State University. Analytic number theory, L-functions. Preprints. |
| Coghlan, Francis: University of Manchester. Diophantine equations, elliptic curves. |
| Cohen, Henri: Mathematics professor at the University Bordeaux I, France. Modular forms and computational number theory. Publications, software. |
| Cohen, Stephen: University of Glasgow. Number theory, algebea, combinatorics. |
| Cojocaru, Alina Carmen: Princeton. Arithmetic geometry with techniques from analytic number theory. Preprints and other links. |
| Coleman, Mark: UMIST. Analytic number theory with special interest in the "geometric" distribution of ideals in number fields. |
| Coleman, Robert: University of California at Berkeley. Arithmetic of modular forms. Preprints and lecture notes. |
| Connell, Ian: McGill University. Arithmetic of elliptic curves. Links to APECS software and Elliptic Curve Handbook. |
| Conrad, Brian: University of Michigan. Contact and teaching information. |
| Conrad, Keith: University of Connecticut. Analytic and algebraic number theory. Research and expository papers. |
| Conrad, Marc: University of Luton. Computational number theory, SIMATH. |
| Conrey, Brian: American Institute of Mathematics / Oklahoma State University / University of Bristol. Analytic number theory, especially the analytic theory of L-functions. Publications, L-function resources. |
| Consani, Katia: University of Toronto. Arithmetic geometry, number theory, non-commutative geometry. |
| Coogan, Gwynneth G.H.: University of Wisconsin. Elliptic curves and L-functions. |
| Coombes, Kevin: University of Texas. Arithmetic algebraic geometry, algebraic K-theory. |
| Cooper, Shaun: Massey University. Special functions, number theory, combinatorics. |
| Cornacchia, Pietro: University of Pisa. Algebraic number theory: ideal class groups for cyclotomic fields, and K-theory of the rings of integers of an abelian number field. |
| Cornelissen, Gunther: University of Utrecht. Arithmetical algebraic geometry, in particular global function fields (moduli-problems, automorphic forms); non-archimedean uniformization, group actions in positive characteristic; diophantine sets. |
| Cornut, Christophe: Institut de Mathématiques de Jussieu, Université Paris 7 Denis Diderot. Arithmetic of elliptic curves; Complex multiplication, Heegner and CM points; Kolyvagin conjectures and congruences. |
| Cosgrave, John: St. Patrick's College, Dublin. Computational number theory, primes and factoring. |
| Costello, Patrick: Eastern Kentucky University. Computational number theory including amicable numbers, Smith numbers, factorization, and primality testing. Quadratic forms over the rationals and quadratic number fields. |
| Cremona, John: University of Nottingham. Number theory, elliptic curves. Tables and software. |
| Croot, Ernest: Georgia Institute of Technology. Combinatorial number theory. |
| Culp-Ressler, Wendell: Franklin and Marshall College. Analytic number theory: Automorphic forms and automorphic integrals, Hecke correspondence, period functions, Dirichlet series, binary quadratic forms, continued fractions. |
| Cusick, Thomas: State University of New York at Buffalo. Cryptography, number theory, Diophantine approximation. |
| Cutter, Pamela: Kalamazoo College. Publications. |
| Tretkoff, Paula Cohen: Texas A+M University. Number theory and geometry, classical and non-commutative. |
Classical
