Ratified conventions by Tonga
- 1972 - Convention on the Prevention and Punishment of the Crime of Genocide
- 1972 - International Convention of the Elimination of All Forms of Racial Discrimination
- 1978 - 1st Geneva Convention for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field
- 1978 - 2nd Geneva Convention For the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea
- 1978 - 3rd Geneva Convention Relative to the Treatment of Prisoners of War
- 1978 - 4th Geneva Convention relative to the protection of civilian persons in time of war
- 1995 - Convention on the Rights of the Child
- 2000 - Convention Relating to the Status of Refugees
- 2000 - Protocol Relating to the Status of Refugees
- 2003 - Additional Protocol Relating to the Protection of Victims of International Armed Conflicts
- 2003 - Additional Protocol Relating to the Protection of Victims of Non-International Armed Conflicts