A free, no-signup guide to every major clinical trial registry in the world. Whether you are in the US, Europe, Asia, Africa, or Latin America, there is a registry that covers your region.
ClinicalTrials.gov is run by the US National Institutes of Health and lists over 490,000 studies worldwide. Even if you are not in the US, this is often the best starting point because many international trials are registered here too.
The world's largest clinical trial registry. Free to search. No account needed. Covers studies in over 220 countries. Updated daily.
Search NowThe WHO International Clinical Trials Registry Platform (ICTRP) is a meta-search portal that searches across all WHO-recognized registries simultaneously. Use it when you want the broadest possible search or when ClinicalTrials.gov does not show trials in your region.
Searches all 19 WHO Primary Registries at once. The single most comprehensive global search available.
Search WHO ICTRPIf you want to search a specific country registry directly, use the list below. All are free and publicly accessible.
Official EU registry for trials in EEA member states. Covers Phase 1 to Phase 4 trials with EU/EEA involvement.
Search EU-CTRAccepts international registrations. Strong UK and global public health representation. WHO-recognized primary registry.
Search ISRCTNGerman Clinical Trials Register. WHO ICTRP primary registry. Covers German-led trials across all intervention types.
Search DRKSWHO ICTRP primary registry for Dutch clinical research. Covers all intervention types including surgical and behavioral trials.
Search NTRAustralian New Zealand Clinical Trials Registry. WHO-recognized. Covers trials in Australia, New Zealand, and internationally recruited from these countries.
Search ANZCTRJapan Registry of Clinical Trials. Merged the former JMACCT and JAPIC registries. WHO-recognized primary registry.
Search jRCTChinese Clinical Trial Registry. WHO ICTRP primary registry. Covers all clinical trials conducted in China or sponsored by Chinese institutions.
Search ChiCTRClinical Trials Registry India. Mandatory registration for all trials conducted in India. WHO-recognized primary registry.
Search CTRIClinical Research Information Service. WHO ICTRP primary registry for South Korean clinical trials. Bilingual interface available.
Search CRiSThai Clinical Trials Registry. WHO ICTRP primary registry. Covers clinical research conducted in Thailand and the greater Southeast Asia region.
Search TCTRSri Lanka Clinical Trials Registry. WHO ICTRP primary registry. Covers trials conducted in Sri Lanka and affiliated research institutions.
Search SLCTRBrazilian Clinical Trials Registry. WHO ICTRP primary registry. Covers all clinical research conducted in Brazil or with Brazilian sponsor involvement.
Search ReBecPeruvian Clinical Trials Registry. WHO ICTRP primary registry. Covers trials authorized by Peru's national health authority (DIGEMID).
Search REPECCuban Public Registry of Clinical Trials. WHO ICTRP primary registry covering Cuban-led trials, including notable vaccine and cancer research.
Search RPCECIranian Registry of Clinical Trials. WHO ICTRP primary registry. Covers all trials conducted in Iran with a bilingual Farsi/English interface.
Search IRCTLebanese Clinical Trials Registry. WHO ICTRP primary registry. Covers Lebanese-sponsored research and trials conducted in Lebanon and the Levant region.
Search LBCTRPan African Clinical Trials Registry. WHO ICTRP primary registry covering the entire African continent. Hosted by the South African Medical Research Council.
Search PACTRWhen you reach out to a study site, they will typically ask you a few screening questions over the phone or email. This is called a pre-screening call. No commitment is required. If you do not meet the criteria for one trial, the coordinator can often point you to other studies that might fit.
You are never obligated to participate, and you can withdraw from a trial at any time without it affecting your other medical care. Participation is always voluntary.
Some trials cover travel costs, provide study medication at no charge, or pay a small stipend for your time. Ask the coordinator about this during the pre-screening call.