After reading How valuable do you find professional memberships? I thought it would be useful to list the various professional groups and associations available.
Discussion of the value (or not) of the groups belongs with the How valuable do you find professional memberships? question.
System Administration Specific
PASS, Professional Association for SQL Server
SAGE-AU, The System Administrators Guild of Australia
sage@guug, System Administration Special Interest Group within the German Unix User Group
The Systems Administrators' Guild of Ireland, The Systems Administrators' Guild of Ireland
SAGE-IE, The Systems Administrators' Guild of Ireland
(Two groups with the same name and different web sites?)
LOPSA, The League of Professional System Administrators
NPA, Network Professional Association
NC*SA, North Carolina System Administrators
IT And Computing in General
ACM, Association for Computing Machinery
IEEE Computer Society, The IEEE Computer Society
ACS, Australian Computer Society
CIPS, Canadian Information Processing Society
BCS, British Computer Society
UKUUG, the UK's Unix & Open Systems User Group
USENIX, The Advanced Computing Systems Association
Please add any more that you know of.