All Countries:Very comprehensive list at Mathematics Archives. Sorted strictly alphabetically.
All Countries:Maintained at Penn State.
Aichi University of Education: Department of Mathematics Education directory of teaching staff.
All Countries: At the American Mathematical Society.
All Countries: Infopoint for Mathematics, Operations Research and Statistics, maintained by Gabriel Uchida.
All Countries: Maintained by Andrej Dujella, University of Zagreb.
All Countries: Maintained by Keith Matthews, University of Queensland.
All Countries: Listed in the Mathematical Virtual Library at Florida State University.
Australia: From the Australian Mathematical Society.
Canada: From the Canadian Mathematical Society.
Denmark: From the Danish Mathematical Society.
Europe: Mathematical Departments in Europe, maintained at Helsinki University
Finland: Maintained at University of Turku.
France: List at Laboratoire J. A. Dieudonné, Université de Nice Sophia-Antipolis.
Germany: From Math-Net.
Germany: At the University of Karlsruhe.
India: Colleges/Institutes/Universities, maintained by Avinash Sodani. Over 1000 institutions listed, over 200 having web pages.
Ireland: From the Irish Mathematical Society.
Ireland: Maintained by Ken Houston, University of Ulster.
Japan: English home pages. Maintained by Keith Matthews, University of Queensland, Australia.
New Zealand: Maintained at Waikatio University.
Poland: At the Polish Academy of Sciences.
Russia and fSU: At Lomonosov Moscow State University.
United Kingdom: Maintained by Chris Eilbeck, Heriot-Watt University.
United Kingdom: Heads of Departments of Mathematical Sciences, the body that represents UK departments of Mathematics and Statistics by co-ordinating senior members of these departments.
United Kingdom: MathGate Secondary Homepages Project. A network of UK departmental homepages in a standard format.
United Kingdom and Ireland: Statistics: UK and Irish university departments of Statistics and related subjects, including Actuarial Mathematics and Operational Research. Maintained at Heriot-Watt University.
United Kingdom Mathematical Institutions: Maintained by the Oxford University Invariants Society.
USA: Shortcuts to Departments of Physics, Engineering, and Mathematics.
USA Historically Black Colleges and Universities: HBCU Mathematics departments online.
USA Mathematics Departments: A list compiled by Keith Matthews.