IMU is an international organization that has no permanent office. Usually, the IMU office is located at the institution of the IMU secretary which also serves as the legal domicile of IMU.

For the period 2007-2010, the address of IMU Secretariat is:

International Mathematical Union
Office of the Secretariat
Zuse Institute Berlin
Takustr. 7
D-14195 Berlin
Germany

Fax: +49 30 84185 - 269
E-mail: secretary@mathunion.org
Secretary: Martin Grötschel

The Secretary is responsible for conducting the ordinary business of the Union and for keeping its records. He also acts as Treasurer.

All official correspondence with IMU should be directed to the IMU secretary.

The International Mathematical Union is grateful to the institutions that have hosted the IMU office in previous years. Beginning in 1950 with the preparations for the (second) foundation of IMU in 1951/1952 the IMU secretariat has operated in the following locations:

• 1950-1952 Kongelige Danske Videnskabernes Selskab (Royal Danish Academy of Sciences and Letters), København, Denmark
• 1952-1956 Università degli Studi di Roma "La Sapienza", Italy
• 1956-1974 Eidgenössische Technische Hochschule (ETH) Zürich, Switzerland
• 1975-1982 Collège de France, Paris, France
• 1983-1990 Helsingin yliopisto (University of Helsinki), Finland
• 1991-1998 Instituto Nacional de Matemática Pura e Aplicada (IMPA), Rio de Janeiro, Brazil
• 1999-2006 Institute for Advanced Study (IAS), Princeton, USA
• 2007- Konrad-Zuse-Zentrum (ZIB), Berlin, Germany