Society for Industrial and Applied Mathematics
AMS takes action in the United States, but SIAM has several branches inside and outside the United States. For example, SIAM has MEXSIAM (Mexico Section of SIAM), ARSIAM (Argentina Section of SIAM), COSIAM (Columbia Section of SIAM), SIAM UKIE (United Kingdom and Republic of Ireland Section of SIAM), and EASIAM (East Asia Section of SIAM).