Clinical trials by country
164 countries with 20 or more registered studies. A study appears under every country it lists a site in, so the counts overlap — most large trials run in several places at once.
- United States192,364
- China53,102
- France42,307
- Canada31,969
- United Kingdom28,386
- Germany28,068
- Turkey25,931
- Italy25,732
- Spain25,162
- Korea, Republic of17,419
- Egypt17,047
- Belgium14,936
- Netherlands14,833
- Taiwan12,706
- Denmark12,514
- Australia12,287
- Brazil11,460
- Poland11,459
- Switzerland10,525
- Israel10,479
- Sweden9,623
- Japan9,213
- Austria7,643
- Czechia6,948
- India6,535
- Pakistan6,032
- Hungary5,787
- Mexico5,708
- Norway5,654
- Russian Federation5,538
- Greece5,224
- Argentina4,702
- Hong Kong4,671
- Finland4,272
- Thailand4,268
- Singapore4,051
- Portugal3,935
- South Africa3,783
- Romania3,630
- Bulgaria3,115
- Puerto Rico3,017
- Chile2,822
- New Zealand2,812
- Ukraine2,662
- Ireland2,640
- Malaysia2,585
- Slovakia2,369
- Colombia2,256
- Serbia1,825
- Saudi Arabia1,725
- Indonesia1,706
- Croatia1,689
- Lithuania1,443
- Peru1,364
- Philippines1,340
- Vietnam1,312
- Iran, Islamic Republic of1,288
- Slovenia1,288
- Russia1,241
- Estonia1,204
- Latvia1,157
- Uganda967
- Georgia925
- Kenya864
- Bangladesh814
- Lebanon782
- Jordan667
- Tunisia654
- United Arab Emirates608
- Tanzania519
- Iraq504
- Nigeria453
- Nepal423
- Guatemala395
- Panama393
- Malawi376
- Belarus366
- Ethiopia361
- Zambia348
- Cyprus332
- Bosnia and Herzegovina317
- Ghana295
- Kazakhstan275
- Qatar263
- Costa Rica260
- Dominican Republic260
- Moldova, Republic of241
- Burkina Faso238
- Iceland237
- Syrian Arab Republic222
- Ecuador216
- Zimbabwe216
- Kuwait215
- Mali208
- Venezuela196
- Morocco178
- Luxembourg171
- Cameroon164
- Rwanda158
- Mozambique157
- Iran144
- Oman144
- Moldova142
- Cambodia140
- North Macedonia136
- Armenia134
- Senegal134
- Honduras133
- Botswana130
- Sri Lanka125
- Algeria124
- Martinique118
- Réunion115
- Congo, The Democratic Republic of the114
- Côte D'Ivoire111
- Guadeloupe106
- Uruguay102
- Monaco101
- Paraguay100
- Gambia89
- Uzbekistan89
- Macedonia, The Former Yugoslav Republic of82
- Syria82
- Jamaica81
- Bolivia76
- Gabon76
- Haiti76
- El Salvador75
- Sudan74
- Guinea-Bissau72
- Albania70
- Kyrgyzstan70
- Bahrain68
- Cuba66
- Democratic Republic of the Congo62
- Benin60
- Malta57
- Sierra Leone57
- Mauritius54
- French Guiana51
- Palestinian Territories50
- Palestinian Territory, occupied48
- Niger47
- Guinea46
- Mongolia44
- Former Serbia and Montenegro42
- Lesotho42
- Myanmar42
- Papua New Guinea42
- Yemen40
- Liberia38
- Madagascar38
- Congo37
- Guam37
- Kosovo35
- Afghanistan33
- Antigua and Barbuda33
- Lao People's Democratic Republic33
- Azerbaijan28
- Montenegro28
- Trinidad and Tobago28
- Nicaragua23
- Belize22
- Bahamas20