USA
France
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Only 2 in war though by USA, all others in tests.
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Many countries have nuclear weapons today including the United States. China, North Korea, South Korea, and Japan also have nuclear weapons.
The United States does not give or sell nuclear weapons to any country. The United States has stationed nuclear weapons on the territory of many countries, but always retained full control of them.
Nuclear weapons were used twice in combat against the Japanese Empire in 1945. In order to decisively end the Pacific War Hiroshima and Nagasaki became the only cities (in so far) to witness a nuclear holocaust. Many nuclear tests have been conducted since, with hydrogen and neutron types also detonated. The last suspected nuclear tests were by North Korea in February 2013.
Currently 9 countries possess nuclear weapons; The United States, United Kingdom, France, Russia, China, Israel, India, Pakistan and North Korea.
While many countries have exploded test weapons, only the United States has ever used Nuclear weapons against an adversary. Two bombs were dropped on two cities in Japan Hiroshima and Nagasaki in 1945, to bring WWII to an end.