Los Angeles NT User Group (LANTUG)
http://www.lantug.org/
Meetings are the second Wednesday of the month, 6:30pm

Independent Computer Consultants Association (ICCA), Los Angeles
http://www.icca.org/losangeles/
Meetings are the second Thursday of the month, 6:00pm

San Gabriel Valley Linux Users Group (LUG)
http://zoot.zzz.iipo.gtegsc.com/Linux/sgvlug.html
Meetings are the second Thursday of the month, 7:00pm

Association of Internet Professionals (AIP), Los Angeles
http://la.us.association.org/
Meetings are the last Tuesday of the month, 7:00pm

Power Graphics User Network (PCUN)
http://www.thetadata.com/
Meetings are the last Tuesday of the month, 7:30pm

Los Angeles Macintosh Group (LAMG)
http://www.lamg.org/
Meetings are the fourth Thursday of the month, 7:30pm

Los Angeles Association for Computing Machinery (ACM)
http://pascal.acm.org/~lac/
Meetings are the first Wednesday of the month, 7:00pm

Pasadena IBM Users Group (PIBMUG)
http://www.pibmug.org/
Meetings are the first Wednesday of the month, 7:00pm

International Interactive Communications Society (IICS), Los Angeles
http://www.la.iics.org/
Meetings are the first Saturday of the month, 10:00am (WebSpinners SIG)

Los Angeles Council of Black Professional Engineers (LACBPE)
http://www.lablackengineers.org/
Meetings are the last Thursday of the month, 7:00pm

Inner City Computer Society (ICCS)
http://www.iccs.org/
Meetings are the fourth Sunday of each 3rd month (quarterly), 2:00pm

Institute of Electrical and Electronics Engineers (IEEE) - USA
California, Los Angeles Council (LAC)
http://www.ewh.ieee.org/r6/lac/
There is no general body meeting. Go to the web site for details.