According to Timatic, since November 2019, nationals of all countries and territories can visit the Gambia without both a visa and entry clearance for up to 28 days (unless otherwise noted) except for the following:[2][3]
Afghanistan
Argentina
Australia
Brazil
Canada
China
Colombia
Costa Rica
El Salvador
Georgia
Guatemala
Iran
Iraq
Israel
Japan
Jordan
Kuwait
Kyrgyzstan
Lebanon
Marshall Islands
Mexico
Mongolia
Myanmar
Nicaragua
Oman
Palestine
Panama
Paraguay
Peru
Qatar
Saudi Arabia
Thailand
Syria
United States
Uruguay
Vietnam
Yemen
Date of visa changes
This list is incomplete; you can help by . (November 2018)
30 April 1980: ECOWAS[4] (Economic Community of West African States): Benin, Burkina Faso, Cape Verde, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone, Togo
Visitor statistics[]
Most visitors arriving to Gambia for tourism purposes were from the following countries of nationality:[5]
1British Overseas Territories. 2 Open border with Schengen Area. 3 Russia is included as a European country here because the majority of its population (80%) lives in European Russia. 4 These countries span the conventional boundary between Europe and Asia. 5 Part of the Realm of New Zealand. 6 Partially recognized. 7Unincorporated territory of the United States. 8 Part of Norway, not part of the Schengen Area, special open-border status under Svalbard Treaty.
9 Part of the Kingdom of Denmark, not part of the Schengen Area.
10Egypt spans the boundary between North Africa and the Middle East.
1British Overseas Territories.
2 Part of the Schengen Area.
3 Open border with Schengen Area.
4Azerbaijan, Georgia, Turkey, Kazakhstan and the partially recognised republics of Abkhazia and South Ossetia each span the conventional boundary between Europe and Asia.
5Cyprus, Armenia, and the partially recognised republics of Artsakh and Northern Cyprus are entirely in Southwest Asia but have socio-political connections with Europe.
6Egypt spans the boundary between North Africa and the Middle East.
7 Partially recognized.
8 Part of the Kingdom of Denmark, not part of the Schengen Area.
9 Russia has territory in both Eastern Europe and Northern Asia. The vast majority of its population (80%) lives in European Russia.
10 Part of the Nordic Passport Union.
The Gambia portal 
United Kingdom
Netherlands
Nigeria
Sweden
Germany
Belgium
Spain
United States
Ireland
France