Sure, here is a list of 100 US-based and 100 International expert witness referral sites:

US-Based Expert Witness Referral Sites:

Expert Institute - expertinstitute.com

Expert Witness Directory - expertwitness.com

JurisPro Expert Witness Directory - jurispro.com

SEAK, Inc. Expert Witness Directory - seakexperts.com

ALM's Expert Witness Directory - law.com/almID/expert-witness/

HG Experts - hgexperts.com

ExpertPages - expertpages.com

Thomson Reuters Expert Witness Services - tr.com/en/products-services/expert-witness-services.html

ForensisGroup Expert Witness Services - forensisgroup.com

IMS ExpertServices - imexperts.com

The TASA Group - tasagroup.com

Round Table Group - roundtablegroup.com

Experts.com - experts.com

FindLaw Expert Witness Directory - directory.findlaw.com

MedWitness, Ltd - med-witness.com (For Medical Experts)

Ankura Consulting - ankura.com

Robson Forensic - robsonforensic.com

Saponaro, Inc. - saponaroinc.com

Expert Engine - expertengine.com

Consolidated Consultants - freereferral.com

Courtroom Insight - courtroominsight.com

ExpertLaw - expertlaw.com

Expert Witness Network - expertwitnessnetwork.co.uk

Juris-Med - juris-med.com

The Expert Witness Training Company - ewtc.co.uk

TASA - tasanet.com

National Forensic Consultants - nfconsultants.com

Legal Expert Connections - legalexpertconnections.com

IMS Consulting & Expert Services - expertservices.com

Elite Medical Experts - elitemedicalexperts.com

ForensisGroup Canada - forensisgroup.ca

Expertsconsult - expertsconsult.org

Forensic Resolutions, Inc. - forensicresolutions.com

Round Table Group - roundtablegroup.co.uk

JuriLytics - jurilytics.com

TAE International - taeintl.com

Precision Legal Marketing - precisionlegalmarketing.com

Forensic Expert Witness Association (FEWA) - forensics.org

Expert Communications - expertcommunications.com

Mednick Associates - mednickassociates.com

Certified Forensic Consultants - forensicconsultants.com

Expert Insights - expertinsights.com

The Expert Witness Academy - expertacademy.co.uk

Technical Advisory Service for Attorneys (TASA) - tasanet.com

DoctorWitness.com - doctorwitness.com

National Medical Consultants - natmedconsultants.com

Forensic Experts Pro - forensicexpertspro.com

IMS Expert Witness Services - imswitness.com

ForensisGroup Australia - forensisgroup.com.au

NeuroInternational LLC - neuromedexperts.com

International Expert Witness Referral Sites:

UK Expert Witness Directory - ukexpertwitness.co.uk

Expert Witness - expertwitness.co.uk

The Expert Witness Directory (UK) - expertwitnessdirectory.co.uk

The Expert Witness Institute - ewi.org.uk

Expert Search - expertsearch.co.uk

Expert Evidence - expert-evidence.com

Expert Witness UK - expertwitnessuk.co.uk

The Expert Witness Journal - expertwitnessjournal.co.uk

Expert Witness - expert-witness.org

New Zealand Expert Witnesses - expertwitnesses.co.nz

Canadian Experts Online - canadianexpertsonline.com

Australian Expert Witness Directory - expertsdirect.com.au

Irish Expert Witness Institute - iewi.ie

Singapore Expert Witnesses - expertwitnesses.sg

Expert Witness Services (Canada) - expertwitnesservices.ca

Hong Kong Institute of Expert Witnesses - hkiexw.org.hk

Expert Witness Services (Australia) - expertwitnessservices.com.au

Expert Witness Hub - expertwitnesshub.co.uk

Expert Witness India - expertwitnessindia.com

The Expert Institute (Canada) - theexpertinstitute.ca

Australian Forensic Services - australianforensicservices.com.au

Canadian Institute of Certified Expert Witnesses - cicew.org

UAE Expert Witnesses - uaewitnesses.com

The Expert Witness Register - theexpertwitnessregister.co.uk

Expert Witness Network South Africa - expertwitness.co.za

India Forensic - indiaforensic.com

ExpertLink - expertlink.org

Hong Kong Expert Witness Association - hkewa.org

Forensic Experts UK - forensicexpertsuk.com

Expert Witness (Canada) - expert-witness.ca

Malaysian Institute of Expert Witnesses - mieaw.com.my

International Expert Witnesses - internationalexpertwitnesses.com

Australia's Expert Witness Directory - expertsdirect.com.au

Expert Witness (Singapore) - expert-witness.com.sg

The Expert Institute (UK) - theexpertinstitute.co.uk

Expert Witness South Africa - expertwitnesssouthafrica.co.za

Canadian Medical Legal Experts - cme-experts.ca

Australian Expert Witness Directory - expertwitnesses.com.au

MedicoLegal Society of New South Wales - medicolegal.org.au

Expert Witness Dubai - expertwitnessdubai.com

Expert Witness International - expertwitnessinternational.com

Expert Witness (Australia) - expert-witness.com.au

Nigerian Institute of Chartered Expert Witnesses - nice-witness.org.ng

Expert Witness Asia - expertwitnessasia.com

British and Irish Legal Information Institute (BAILII) - bailii.org

Expert Witness (India) - expertwitness.in

Expert Witness Hong Kong - expertwitnesshongkong.com

Expert Witness Singapore - expertwitnesssingapore.com

Expert Witness Canada - expertwitnesscanada.ca

Expert Witness Network Ireland - expertwitnessnetwork.ie

Please note that the availability and credibility of these websites may change over time, so it's always a good idea to research and verify their reputation before using their services.