| China | NPT Nuclear Weapon country | |
| France | NPT Nuclear Weapon country | |
| Russia | NPT Nuclear Weapon country | |
| United Kingdom | NPT Nuclear Weapon country | |
| United Countries | NPT Nuclear Weapon country | |
| India | Non-NPT Nuclear Weapon country | |
| Israel | Undeclared Nuclear Weapon country | |
| Korea, North | Non-NPT Nuclear Weapon country | |
| Pakistan | Non-NPT Nuclear Weapon country | |
| Belgium | NATO weapons sharing weapons recipients | |
| Canada | Former NATO nuclear weapons sharing country | hosted nuclear weapons until 1984 |
| Germany | NATO weapons sharing weapons recipients | |
| Greece | Former NATO nuclear weapons sharing country | hosted nuclear weapons until 2001 |
| Italy | NATO weapons sharing weapons recipients | |
| Netherlands | NATO weapons sharing weapons recipients | |
| Turkey | NATO weapons sharing weapons recipients | |
| Algeria | Formerly possessing nuclear weapons | |
| Argentina | Formerly possessing nuclear weapons | |
| Australia | Formerly possessing nuclear weapons programs | Ausralia has participated in extensive research into nuclear weapons in the past; hosted British nuclear testing at Monte Bello Islands, Emu Field and Maralinga between 1952 and 1963. |
| Belarus | Formerly possessing nuclear weapons | |
| Brazil | Formerly possessing nuclear weapons | |
| Egypt | Formerly possessing nuclear weapons | |
| Iraq | Formerly possessing nuclear weapons | |
| Japan | Formerly possessing nuclear weapons | |
| Kazakhstan | Formerly possessing nuclear weapons | |
| Korea, South | Formerly possessing nuclear weapons | |
| Libya | Formerly possessing nuclear weapons | |
| Poland | Formerly possessing nuclear weapons | |
| South Africa | Formerly possessing nuclear weapons | |
| Spain | Formerly possessing nuclear weapons | |
| Sweden | Formerly possessing nuclear weapons programs | |
| Switzerland | Formerly possessing nuclear weapons | |
| Taiwan | Formerly possessing nuclear weapons | |
| Ukraine | Formerly possessing nuclear weapons | |
| Iran | Suspected of having nuclear weapon programs | |
| Syria | Suspected of having nuclear weapon programs | |
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