TWAS identified 66 developing countries in which capacity in science and technology is significantly lagging. The list includes the 45 least developed countries identified by the United Nations, to which 21 other countries were added because of their low-income levels and specific needs for support in building research capacity.
TWAS and its partner, the Organization for Women in Science for the Developing World (OWSD), set these as priority countries for support. From 2017, all OWSD PhD fellowships and many TWAS research grants are reserved for scientists in these countries.
- Afghanistan
- Angola
- Bangladesh
- Benin
- Bhutan
- Bolivia (Plurinational State of)
- Burkina Faso
- Burundi
- Cambodia
- Cameroon
- Central African Republic (the)
- Chad
- Comoros (the)
- Congo (the)
- Côte d’Ivoire
- Democratic Republic of the Congo (the)
- Djibouti
| - El Salvador
- Equatorial Guinea
- Eritrea
- Eswatini
- Ethiopia
- Gambia (the)
- Ghana
- Guatemala
- Guinea
- Guinea-Bissau
- Haiti
- Honduras
- Kenya
- Kiribati
- Lao People's Democratic Republic (the)
- Lesotho
- Liberia
| - Madagascar
- Malawi
- Mali
- Mauritania
- Mongolia
- Mozambique
- Myanmar
- Nepal
- Nicaragua
- Niger (the)
- Paraguay
- Rwanda
- Sao Tome and Principe
- Senegal
- Sierra Leone
- Solomon Islands
| - Somalia
- South Sudan
- Sri Lanka
- State of Palestine (the)
- Sudan (the)
- Syrian Arab Republic (the)
- Tajikistan
- Timor-Leste
- Togo
- Tuvalu
- Uganda
- United Republic of Tanzania (the)
- Vanuatu
- Yemen
- Zambia
- Zimbabwe
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