 (UK) University of Oxford - http://www.maths.ox.ac.uk/groups/number-theory Number Theory Group. Members, publications, meetings. |
 (USA) University of South Carolina - http://www.math.sc.edu/~filaseta/numthry.html Number Theory Group. Members, research interests, courses, links. |
 (USA) Boston University - http://math.bu.edu/research/algebra/ Algebra and Number Theory Research Group. Members, research interests, seminars, courses. |
 (UK) University of Cambridge - http://www.dpmms.cam.ac.uk/Seminars/NumberT/ Number Theory Seminar. Meetings. |
 (UK) University of York - http://www-users.york.ac.uk/~mmd1/numbertheory/ Number Theory Research Group. |
 (Poland) Polish Academy of Sciences - http://www.impan.gov.pl/About/numberth.html Department of Number Theory. Members, research interests, publications. |
 (USA) Southwestern Center for Arithmetical Algebraic Geometry - http://swc.math.arizona.edu/ Based at the University of Arizona, in collaboration with the Universities of New Mexico, Southern California, and Texas. Annual conference. |
 (Canada) University of Toronto - http://www.math.toronto.edu/kc/ntrts/ Number Theory/Representation Theory Seminar. Schedule of meetings. |
 (Spain) Seminari de Teoria de Nombres de Barcelona (UPC) - http://www-ma2.upc.edu/~quer/STNBUPC.html Members, research topics, publications, schedules. |
 (USA) University of Rochester - http://www.math.rochester.edu/research/algebra_and_number_theory/ Algebra and Number Theory Group. Members, research interests, seminar schedule. |
 (USA) University of California, Los Angeles - http://www.math.ucla.edu/~ntg/ Number Theory Group. Members, events, resources. |
 (Canada) University of British Columbia - http://www.math.ubc.ca/~gerg/NT/ Number Theory group. Members, research areas and meetings. |
 (UK) University of Glasgow - http://www.maths.gla.ac.uk/research/groups/ntc/ Number Theory and Combinatorics. Staff, research interests. |
 (USA) University of Georgia - http://www.math.uga.edu/~lorenz/Number_Theory_Group.html Number Theory and Arithmetic Geometry Group. Members, seminars. |
 (Netherlands) CWI, Amsterdam - http://db.cwi.nl/projecten/project.php4?prjnr=84 Computational number theory group. Members, research interests, publications. |
 (Russia) Steklov Institute, Moscow - http://www.mi.ras.ru/departm/chisel_e.html Department of Number Theory. History, research projects, profiles. |
 (Canada) CICMA, Concordia University, Montreal - http://cicma.mathstat.concordia.ca/number.html Number Theory Page. Members, seminars, preprints. |
 (UK) King's College, University of London - http://www.mth.kcl.ac.uk/research/numbtheo/ Number Theory Group. Staff, meetings, preprints. |
 (Canada) McMaster University - http://icarus.math.mcmaster.ca/marshall/numbertheorySem.html Algebra/Number Theory Seminar. Meetings, abstracts. |
 (UK) Nottingham University - http://www.maths.nott.ac.uk/personal/ibf/ntag.html Number Theory and Arithmetic Geometry research group. Research interests, members, visitors, meetings. |
 (USA) New York Joint Number Theory Seminar - http://math.gc.cuny.edu/seminars/jointnumbertheory.html Rotates between Columbia University, CUNY Graduate Center and NYU. |
 (UK) University of East Anglia - http://www.mth.uea.ac.uk/~h090/number_theory.html Number Theory research. |
 (USA) Penn State - http://www.math.psu.edu/vstein/alg/antheory/numtheory.html Algebra and number theory group. Members, seminars, preprints, links. |
 (USA)University of Michigan - http://www.math.lsa.umich.edu/research/number_theory/ Graduate Program in Number Theory. Staff, research interests, courses, seminars. |
 (USA) University of California, Santa Barbara - http://www.math.ucsb.edu/~agboola/SGA.html Arithmetic and Geometry Seminar. Meetings. |
 (USA) University of Wisconsin, Madison - http://www.math.wisc.edu/~ono/algebra.html Algebra, Combinatorics and Number Theory Group. Members, seminars. |
 (USA) University of Illinois at Urbana-Champaign - http://www.math.uiuc.edu/ResearchAreas/numbertheory/index.html Number Theory faculty, visitors, meetings, courses, events. |
 (Canada) Queen's University, Kingston - http://www.mast.queensu.ca/graduate/alge.php Algebra and Number Theory Group. Members, research interests. |
 (USA) University of Texas - http://www.ma.utexas.edu/~voloch/numberthy.html Number Theory Group. Members, meetings, software. |
 (Germany) Technische Universität, Berlin - http://www.math.tu-berlin.de/algebra/ Algebra and Number Theory: the KANT group. Members, software (KANT/KASH), publications. |
 (Germany) University of Heidelberg - http://www.iwr.uni-heidelberg.de/groups/compalg/ Algorithmic Algebra and Number Theory. Members, research, activities, software, links. |
 (Europe) GTEM: Galois Theory and Explicit Methods in Arithmetic - http://www.math.jussieu.fr/~leila/gtem/gtem.html Research training network coordinated in Paris, uniting twelve teams from July 2000 until June 2004. |
 (Finland) University of Turku - http://www.math.utu.fi/research/numbertheory/ Number Theory Group. Members, research interests. |
 (Lithuania) Vilnius University - http://www.mif.vu.lt/katedros/ttsk/home1.htm Department of Probability Theory and Number Theory. |
 (Hungary) Lajos Kossuth University, Debrecen - http://www.math.klte.hu/algebra/indexa.htm Department of Algebra and Number Theory. Staff list. |
 (Hungary) Alfréd Rényi Institute of Mathematics, Hungarian Academy of Sciences - http://www.math-inst.hu/staff/number.html Number Theory research group staff. |
 (Croatia) University of Zagreb - http://www.math.hr/~duje/semeng.html Seminar on Number Theory and Algebra. Members, seminars, links. |
 (Sweden) Uppsala University - http://www.math.uu.se/research/iii/ Mathematics III research group: quantum chaos and number theory. |
 (Slovakia) Comenius University, Bratislava - http://www.uniba.sk/mffuk/e/departments/katc_e.htm Department of Algebra and Number Theory. Research topics, contact information. |
 (Singapore) National University - http://www.math.nus.edu.sg/~mattankm/AlgSem/ Algebra and Number Theory Seminar. Schedule of meetings. |
 (Germany) University of Regensburg/Leipzig - http://www.mathematik.uni-regensburg.de/FGAlgZyk/index-en.html Algebraic Cycles and L-Functions research group. People, preprints, seminars, workshops, positions, news. |
 (Germany) University of Siegen - http://wotan.algebra.math.uni-siegen.de/~countnumber/ Algebra and Number Theory group. Members, research interests. |
 (Germany) Clausthal University of Technology - http://www.math.tu-clausthal.de/Arbeitsgruppen/Zahlentheorie/Welcome_en.html Institut für Mathematik - Number Theory Research Group. People, research topics. |
 (Netherlands) University of Leiden - http://www.math.leidenuniv.nl/~desmit/numth/ Number theory research group. Staff, events, links. |
 (Austria) University of Natural Resources, Vienna - http://www.boku.ac.at/math/nth.html Number theory group led by Werner Georg Nowak. Members, research interests, publications, links. |
 (Israel) Ben Gurion University of the Negev - http://www.math.bgu.ac.il/~efrat/resgroup.html Number Theory and Algebraic Geometry Research Group. Members, research interest, seminars. |
 (Austria) Technical University of Graz - http://finanz.math.tu-graz.ac.at/finanz/nth_eng.html Algorithmic and Probabilistic Number Theory Research Group. Members, research interests. |
 (Japan) Okayama University - http://www.math.okayama-u.ac.jp/number.html Number Theory Group. Members. |
 (China) Shandong University - http://www.prime.sdu.edu.cn/ Number theory research group. Members, research interests, courses, events. |
 (Italy) University of Pisa - http://www.dm.unipi.it/gauss-pages/melfi/public_html/ Number Theory Group. Research interests and members. |
 (Ukraine) Tavrical National University - http://www.ccssu.crimea.ua/eng/structure/math_fac/algebra.htm Department of Algebra and Number Theory. Members, research interests, publications. |
 (Europe) Arithmetic Algebraic Geometry - http://www.arithgeom-network.univ-rennes1.fr/ A European network of 12 working groups from 6 countries. |