| Albania | Accepted |
| Argentina | Accepted |
| Armenia | Accepted |
| Australia | |
| Austria | |
| Azerbaijan | Accepted |
| Bahrain | Accepted |
| Belarus | Accepted |
| Brazil | Not accepted |
| Bulgaria | Accepted |
| Cambodia | Accepted |
| Canada | Trump rescinded the invitation |
| China | Not accepted |
| Croatia | Declined |
| Cyprus | |
| Egypt | Accepted |
| El Salvador | Accepted |
| European Commission | |
| Finland | |
| France | Declined |
| Germany | Declined |
| Greece | |
| Hungary | Accepted |
| India | Not accepted |
| Indonesia | Accepted |
| Ireland | Declined |
| Israel | Accepted |
| Italy | Declined - Observer |
| Japan | Not accepted |
| Jordan | Accepted |
| Kazakhstan | Accepted |
| Kosovo | Accepted |
| Kuwait | Accepted |
| Mexico | Declined |
| Mongolia | Accepted |
| Morocco | Accepted |
| Netherlands | |
| New Zealand | Declined |
| Norway | Declined |
| Oman | |
| Pakistan | Accepted |
| Paraguay | Accepted |
| Poland | |
| Pope Leo XIV | |
| Portugal | |
| Qatar | Accepted |
| Romania | Observer |
| Russia | Accepted |
| Saudi Arabia | Accepted |
| Singapore | |
| Slovenia | Declined |
| South Korea | Not accepted |
| Spain | Declined |
| Sweden | Declined |
| Switzerland | |
| Thailand | |
| Turkey | Accepted |
| Ukraine | Declined |
| United Arab Emirates | Accepted |
| United Kingdom | Declined |
| United States | Accepted |
| Uzbekistan | Accepted |
| Vatican | Declined |
| Vietnam | Accepted |
Sources: “Mexico declines Trump’s invitation to join Board of Peace: Tuesday’s mañanera recapped,” Mexico News, (February 17, 2026).
“Italy, Romania to join Trump's 'Board of Peace' as observers,” Euractiv, (February 15, 2026).
Miranda Jeyaretnam, “Who’s Accepted and Who’s Rejected Invites to Join Trump’s Board of Peace,” Time, (February 28, 2026).