At present there are 9 countries in the world that possess nuclear weapons. They are: These states have roughly 12,331 nuclear warheads, with over 9,600 in active military stockpiles, according to the Federation of Atomic Scientists' 2025 Status of the Worlds Nuclear Forces., The first to have nuclear arms were the five original nuclear weapons states — the United States, Russia, China, France and the United Kingdom. All five are signatories to the Nuclear Nonproliferation Treaty, which commits countries that don’t have nuclear arms not to build or obtain them, and those that do to “pursue negotiations in good , Nine countries currently either say they have nuclear weapons or are believed to possess them. The first to have nuclear arms were the five original nuclear weapons states — the United States , Below is a list of states with nuclear weapons, categorized according to states that are known to currently possess nuclear weapons, those believed to possess nuclear weapons without public acknowledgment, and those that formerly possessed nuclear weapons but no longer do., Overview of the world's nuclear arsenals in 2025, listing the number of warheads by country. Data includes all known nuclear powers and their estimated stockpiles., Which country has the most nuclear weapons? The U.S. and Russia possess approximately 87% of the world’s total nuclear weapon stockpile, according to the Association of American Scientists, with .