Findex MarketResearch.com
http://findexonline.com/

International Market Research Mall
http://www.imrmall.com/

Marketsearch
http://www.marketsearch-dir.com/

Profound
http://www.profound.com/

International Market Research Information
http://www.imriresearch.com

The ESOMAR (European Society for Opinion and Marketing Research)
http://www.esomar.nl/directory.htm
Directory of research organizations listing about 1,300 companies worldwide.

The Marketing Research Association's Blue Book
http://www.bluebook.org/

British Market Research Association directory
http://www.bmra.org.uk/bmra.html

Market Research Society of Australia
http://www.mrsa.com.au/index.html
Includes a directory of members and a directory of syndicated research.

Activ Media
http://www.activmedia.com/

American demographics
http://www.demographics.com/

APT Strategies
http://www.aptstrategies.com.au/default.htm

Asian Demographics
http://www.asiandemographics.com/

Asociacion para la Investigacion de los Medios de Comunicacion
http://www.aimc.es/aimc/html/aimc/aimc.html

BMRB International
http://bmrb.mediatel.co.uk/

Business Communications Company
http://www.buscom.com/

Business Intelligence
http://www.business-intelligence.co.uk/

Central Europe Automotive Report
http://www.cear.com

Computer Technology Research Corp
http://www.ctrcorp.com/

Corporate Intelligence on Retailing
http://www.cior.com/

Dafsa
http://www.dafsa.fr/

Datamonitor
http://www.datamonitor.com/

DSA Group
http://www.dsasiagroup.com/

Euromonitor International
http://www.euromonitor.com/

Find/SVP
http://www.findsvp.com/

A Slovak market research company
http://www.prieskum.sk/eng/default.asp
They are also involved in the NetProjekt study of internet use in Slovakia

Forrester Research
http://www.forrester.com/

Freedonia Group
http://www.freedoniagroup.com/

Frost and Sullivan
http://www.frost.com/

Gartner Group
http://www.gartner.com/

Global Risk Assessments Inc.
http://www.grai.com/

Gobi International
http://www.gobi.co.uk/

IMS Health
http://www.ims-global.com/

Insight Research Corporation
http://www.insight-corp.com

Intelliquest
http://www.intelliquest.com/

International Data Corporation
http://www.idcresearch.com

Internet Advertising Bureau
http://www.iab.net/

Jupiter Communications
http://www.jup.com/

Key Note Information Centre
http://www.keynote.co.uk/

Leatherhead Food Research Association
http://www.lfra.co.uk/index.html

Market Tracking International
http://www.marketfile.co.uk/

Mintel
http://www.mintel.co.uk/

MRM Projects Limited
http://www.mrmprojects.com

National Opinion Poll
http://www.nopres.co.uk/

A C Nielsen
http://www.acnielsen.com/

Nielsen Media Research
http://www.nielsenmedia.com/

The NPD Group
http://www.npd.com/

Nua Internet surveys
http://www.nua.ie/surveys/

Opinion Research Corporation International
http://www.opinionresearch.com/

PJB Publications
http://www.pjbpubs.co.uk/

Simba Information
http://www.simbanet.com/

Taylor Nelson AGB
http://www.tnagb.com/

Yankee Group
http://www.yankeegroup.com/