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 States196,932
- China55,055
- France43,312
- Canada32,777
- United Kingdom29,146
- Germany28,747
- Turkey27,255
- Italy26,459
- Spain25,836
- Korea, Republic of17,884
- Egypt17,819
- Belgium15,348
- Netherlands15,224
- Taiwan13,084
- Denmark12,845
- Australia12,604
- Brazil11,774
- Poland11,766
- Switzerland10,763
- Israel10,751
- Sweden9,882
- Japan9,427
- Austria7,836
- Czechia7,109
- India6,693
- Pakistan6,371
- Hungary5,922
- Mexico5,871
- Norway5,794
- Russian Federation5,492
- Greece5,383
- Argentina4,821
- Hong Kong4,796
- Finland4,397
- Thailand4,375
- Singapore4,141
- Portugal4,039
- South Africa3,884
- Romania3,729
- Bulgaria3,178
- Puerto Rico3,080
- Chile2,900
- New Zealand2,882
- Ukraine2,736
- Ireland2,711
- Malaysia2,661
- Slovakia2,437
- Colombia2,331
- Serbia1,871
- Saudi Arabia1,792
- Indonesia1,787
- Croatia1,749
- Lithuania1,491
- Russia1,431
- Peru1,389
- Vietnam1,369
- Philippines1,367
- Slovenia1,325
- Iran, Islamic Republic of1,286
- Estonia1,229
- Latvia1,186
- Uganda986
- Georgia968
- Kenya891
- Bangladesh850
- Lebanon804
- Jordan703
- Tunisia682
- United Arab Emirates628
- Tanzania532
- Iraq528
- Nigeria462
- Nepal433
- Guatemala404
- Panama401
- Malawi384
- Belarus370
- Ethiopia370
- Zambia357
- Cyprus351
- Bosnia and Herzegovina325
- Ghana306
- Kazakhstan288
- Qatar271
- Dominican Republic267
- Costa Rica264
- Burkina Faso247
- Iceland245
- Moldova, Republic of238
- Ecuador223
- Syrian Arab Republic222
- Zimbabwe221
- Kuwait220
- Mali210
- Venezuela202
- Iran197
- Morocco180
- Luxembourg176
- Cameroon169
- Rwanda162
- Mozambique159
- Moldova153
- Oman150
- Cambodia142
- North Macedonia141
- Honduras139
- Armenia135
- Senegal135
- Botswana133
- Sri Lanka130
- Algeria125
- Martinique122
- Réunion115
- Côte D'Ivoire114
- Guadeloupe113
- Congo, The Democratic Republic of the111
- Uruguay108
- Monaco103
- Paraguay102
- Syria100
- Uzbekistan92
- Gambia89
- Macedonia, The Former Yugoslav Republic of82
- Jamaica81
- El Salvador80
- Gabon80
- Bolivia78
- Haiti78
- Sudan76
- Democratic Republic of the Congo72
- Guinea-Bissau72
- Albania71
- Bahrain71
- Kyrgyzstan70
- Cuba67
- Benin62
- Sierra Leone59
- Mauritius58
- Malta57
- French Guiana53
- Palestinian Territories51
- Guinea48
- Palestinian Territory, occupied48
- Niger47
- Yemen47
- Mongolia44
- Papua New Guinea43
- Former Serbia and Montenegro42
- Lesotho42
- Myanmar41
- Madagascar40
- Liberia38
- Guam37
- Congo36
- Afghanistan34
- Kosovo34
- Azerbaijan31
- Lao People's Democratic Republic30
- Trinidad and Tobago30
- Montenegro28
- Nicaragua23
- Belize22
- Bahamas20
- Laos20