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This is a list of Institutes of Mathematics or Mathematical Institutes.

Americas

American Institute of Mathematics
Clay Mathematics Institute, Cambridge, Massachusetts
Centre de Recherches Mathématiques, at the Université de Montréal
Center for Mathematical Modeling, at the University of Chile
Centro de Investigación en Matemáticas, Guanajuato, Guanajuato in Mexico
Courant Institute of Mathematical Sciences, at New York University
Fields Institute, at the University of Toronto
Institute for Advanced Study, in Princeton, New Jersey
Institute for Mathematics and its Applications, at the University of Minnesota
Institute for Pure and Applied Mathematics, at the University of California, Los Angeles
Instituto Nacional de Matemática Pura e Aplicada, Rio de Janeiro, Brazil
Mathematical Sciences Research Institute, at the University of California, Berkeley
PPGMAp, at the Universidade Federal do Rio Grande do Sul in Brazil

Europe

Brunel Institute of Computational Mathematics, in Uxbridge, UK
Central Economic Mathematical Institute, at the Russian Academy of Sciences
Centre de Recerca Matemàtica, at the Autonomous University of Barcelona
Centrum Wiskunde & Informatica, at Science Park, Amsterdam
CoMPLEX, at University College London
Fachinformationszentrum Karlsruhe, Germany
Hamilton Mathematics Institute, at Trinity College, Dublin, Ireland
Hausdorff Center for Mathematics, Bonn, Germany
Institut de Mathématiques de Toulouse, France
Institute for Experimental Mathematics, at the University of Duisburg-Essen in Germany
Institute of Mathematics (National Academy of Sciences of Belarus)
Institute of Mathematics of the National Academy of Sciences of Ukraine
Institute of Mathematics and its Applications, a UK society
The Institute of Mathematics and Computer Science, University of Latvia
Institute of Mathematics and Informatics (Bulgarian Academy of Sciences)
Institute of Mathematics of National Academy of Sciences of Armenia
Institute of Mathematics of the Romanian Academy at Bucharest
Institute of Mathematics, Physics, and Mechanics in Slovenia
Institut des Hautes Études Scientifiques, near Paris, France
Institut Henri Poincaré, Paris, France
International Centre for Mathematical Sciences, at Edinburgh
Isaac Newton Institute, at the University of Cambridge
János Bolyai Mathematical Institute, at the University of Szeged in Hungary
Keldysh Institute of Applied Mathematics, at the Russian Academy of Sciences
The Mathematical Institute, University of Oxford
Max Planck Institute for Mathematics, Bonn, Germany
Max Planck Institute for Mathematics in the Sciences at Leipzig
Mittag-Leffler Institute, Stockholm. Sweden
Moscow State Institute of Electronics and Mathematics
Oberwolfach Research Institute for Mathematics, Oberwolfach, Germany
Steklov Institute of Mathematics, Moscow, Russia
University of Copenhagen Institute for Mathematical Sciences

Asia

Chennai Mathematical Institute, India
CR Rao Advanced Institute of Mathematics, Statistics and Computer Science, at the University of Hyderabad in India
Einstein Institute of Mathematics, Jerusalem
Harish-Chandra Research Institute, Allahabad, India
Indian Statistical Institute, Kolkata in India
Institute for Studies in Theoretical Physics and Mathematics, Tehran, Iran
Institute of Applied Physics and Computational Mathematics, Beijing
Institute of Mathematical Sciences, Chennai, India
Institute of Mathematics and Applications, Bhubaneswar, India
National Institute for Mathematical Sciences, Korea
Korea Institute for Advanced Study, Korea
Research Institute for Mathematical Sciences, at Kyoto University, Japan
Institute of Statistical Mathematics in Tokyo, Japan
TIFR Centre for Applicable Mathematics, India

Australia

Australian Mathematical Sciences Institute at the University of Melbourne

Africa

African Institute for Mathematical Sciences, Muizenberg, South Africa

Statistical mathematics

Institute of Mathematical Statistics, United States
Institute of Statistical Mathematics, Japan