International organizations mainly occupied in fields closely related to that of IUTAM can be admitted by the General Assembly as affiliated organizations of the Union.

Each affiliated organization has the right to appoint an observer, who is invited to take part in the General Assembly without voting rights. The IUTAM Bureau has the reciprocal right to appoint a nonvoting observer to the corresponding council or other executive body of the affiliated organization.

The affiliated organization and IUTAM are mutually obliged to keep each other informed about all important activities of and organizational measures taken. In organizing international scientific meetings the Union and each of the affiliated organizations are obliged to consider carefully all measures already taken by the Union and its affiliated organizations in order to coordinate such international scientific activities. Affiliated organizations pay no annual dues to the Union.

AFMC (1982)
Asian Fluid Mechanics Committee
Chinese Academy of Sciences, No. 15, North Sihuanxi Rd, 100080, Beijing, China
President/Chair: Prof. Jiachun Li
Representative of AFMC in IUTAM: Prof. Jiachun Li
Representative of IUTAM in AFMC: Prof. Heng Zhou

BICTAM (2010)
Beijing International Center for Theoretical and Applied Mechanics
Institute of Mechanics, Chinese Academy of Sciences, 15 Beisihuanxi Road, 100190, Beijing, China
President/Chair: Prof. Jiachun Li
President/Chair: Prof. Haiyan Hu
Representative of BICTAM in IUTAM: Prof. Haiyan Hu
Representative of IUTAM in BICTAM: Prof. Narinder Gupta

CACOFD (1992)
Caribbean Congress of Fluid Dynamics
The Department of Math and Computer Science, The University of the West Indies, St. Augustine , Trinidad, West Indies
President/Chair: Prof. F. Malpica
Contact: Prof. Harold Ramkissoon
Secretary: Dr. Donna Comissiong
Representative of CACOFD in IUTAM: Prof. Harold Ramkissoon
Representative of IUTAM in CACOFD: Prof. Daniel Joseph

CISM (1970)
International Centre for Mechanical Sciences
Palazzo del Torso, Piazza Garibaldi, I-33100 , Udine, Italy
President/Chair: Prof. Vinicio Turello
Secretary: Prof. Bernhard Schrefler
Representative of CISM in IUTAM: Prof. Bernhard Schrefler
Representative of IUTAM in CISM: Prof. Frédéric Dias

EUROMECH (1978)
European Mechanics Society
University of Padova, Faculty of Engineering, Dipartimento di Costruzioni e Trasporti, , 35131, Padova, Italy
President/Chair: Prof. Patrick Huerre
Secretary: Prof. Bernhard Schrefler
Representative of EUROMECH in IUTAM: Prof. Patrick Huerre
Representative of IUTAM in EUROMECH: Prof. Timothy Pedley

HYDROMAG (1996)
International Association for Hydromagnetic Phenomena and Applications
Dept of Mat. Sciences, University of Nagoya , Furo-cho, Chikusa-ku, 464-0, Nagoya, Japan
President/Chair: Prof. René Moreau
Secretary: Prof. André Thess
Representative of HYDROMAG in IUTAM: Prof. René Moreau
Representative of IUTAM in HYDROMAG: Prof. Keith Moffatt

IABEM (1994)
International Association for Boundary Element Methods

President/Chair: Martin Schanz
Representative of IABEM in IUTAM: Naosi Nishimura
Representative of IUTAM in IABEM: Naosi Nishimura

IACM (1984)
International Association for Computational Mechanics
International Center for Numerical Methods in Engineering , Edificio C-1, Gran Capitán s/n, E-08034 , Barcelona, Spain
President/Chair: Prof. Genki Yagawa
Secretary: Prof. Antonio Huerta
Representative of IACM in IUTAM: Prof. Pierre Ladevèze
Representative of IUTAM in IACM: Prof. Eduardo de Arantes e Oliveira

IAVSD (1977)
International Association for Vehicle System Dynamics
Department of Mechanics, Faculty of Mechanical Engineering, Czech International University in Prague, Kalovo Nanesti 13, , 121 35 , Praha 2, Czech Republic
President/Chair: Prof. Hans True
Secretary: Prof. Michael Valásek
Representative of IAVSD in IUTAM: Prof. Mats Berg
Representative of IUTAM in IAVSD: Prof. Werner Schiehlen

ICA (1998)
International Commission for Acoustics

President/Chair: Michael Vorländer
Secretary: Mrs. Marion Burgess
Representative of ICA in IUTAM: Michael Vorländer
Representative of IUTAM in ICA: Prof. Andrew Norris

ICF (1978)
International Congress on Fracture
School of Science and Engineering, Teikyo University , Toyosatodai 1-1, 320, Utsunomiya, Japan
President/Chair: Prof. Alberto Carpinteri
Contact: Prof. Robert McMeeking
Secretary: Prof. A.T. Yokobori Jr.
Representative of ICF in IUTAM: Prof. Robert McMeeking
Representative of IUTAM in ICF: Prof. Jean-Baptiste Leblond

ICHMT (1972)
International Centre for Heat and Mass Transfer
Mechanical Engineering Dept., Middle East Technical University, 6531, Ankara, Turkey
President/Chair: Geoffrey Hewitt
Secretary: Prof. Faruk Arinc
Representative of ICHMT in IUTAM: Prof. Faruk Arinc
Representative of IUTAM in ICHMT: Dr. Rudolf Dvorák

ICM (1982)
International Congress on Mechanical Behaviour of Materials,
Dept. of Mechanical Engineering, University of Alberta, , T6G 2G8, Edmonton, Canada
President/Chair: Prof. Soo Woo Nam
Secretary: Prof. Toshihiko Hoshide
Representative of ICM in IUTAM: Prof. Soo Woo Nam
Representative of IUTAM in ICM: Prof. Sol Bodner

ICR (1974)
International Committee on Rheology
International Committee on Rheology
President/Chair: Prof. Gerald Fuller
Contact: Prof. Manfred Wagner
Contact: Prof. Masato Abe
Representative of ICR in IUTAM: Prof. Gary Leal

ICTS (2002)
International Congresses on Thermal Stresses
St. Raphael, Apt. 1209, 7117 Pelican Bay Blvd., Fl 34108, Naples, USA
President/Chair: Prof. Richard Hetnarski
Secretary: Prof. Theodore Tauchert
Representative of ICTS in IUTAM: Prof. Richard Hetnarski
Representative of IUTAM in ICTS: Prof. Masato Abe

IIAV (1997)
International Institute of Acoustics and Vibration
Dept. of Mechanical Engineering, Auburn University, 201 Ross Hall, AL 36849, Auburn, USA
President/Chair: Hans Boden
Contact: Prof. Malcolm Crocker
Secretary: Semyung Wang
Representative of IIAV in IUTAM: Prof. Malcolm Crocker
Representative of IUTAM in IIAV: Prof. Jan Achenbach

ISIMM (1977)
International Society for the Interaction of Mechanics and Mathematics
, Department of Mechanical and Structural Engineering, University of Trento, Via Mesiano 77, Trento, Italy
President/Chair: Prof. Lev Truskinovsky
Secretary: Prof. Davide Bigoni
Representative of ISIMM in IUTAM: Prof. Michael Hayes
Representative of IUTAM in ISIMM: Prof. Gérard Iooss

ISSMO (1996)
International Society for Structural and Multidisciplinary Optimization
Department of Structural Mechanics, Budapest University of Technology and Economics , Muegyetem rkp. 3, Kmf 35, H-1521 , Budapest, Hungary
President/Chair: Prof. Ole Sigmund
Contact: Prof. Niels Olhoff
Secretary: Prof. Helder Rodrigues
Representative of ISSMO in IUTAM: Prof. Helder Rodrigues
Representative of IUTAM in ISSMO: Prof. Niels Olhoff